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Finding the Fourth Proportional to 561.67, 775.11 and 328.75

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Solution

The fourth proportional to 561.67, 775.11 and 328.75 is: 453.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.67 : 775.11 = 328.75 : x
  2. Step 2: Convert to fraction form
    561.67/775.11 = 328.75/x
  3. Step 3: Cross multiply
    561.67x = 775.11 × 328.75
  4. Step 4: Simplify right side
    561.67x = 254,817.41
  5. Step 5: Solve for x
    x = 254,817.41/561.67
  6. Step 6: Final answer
    x = 453.68

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Find fourth proportional to 280.84, 387.56 and 164.38
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.