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Finding the Fourth Proportional to 561.63, 775.13 and 328.76

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Solution

The fourth proportional to 561.63, 775.13 and 328.76 is: 453.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.63 : 775.13 = 328.76 : x
  2. Step 2: Convert to fraction form
    561.63/775.13 = 328.76/x
  3. Step 3: Cross multiply
    561.63x = 775.13 × 328.76
  4. Step 4: Simplify right side
    561.63x = 254,831.74
  5. Step 5: Solve for x
    x = 254,831.74/561.63
  6. Step 6: Final answer
    x = 453.74

Related Problems

Find fourth proportional to 280.82, 387.57 and 164.38
Half scale
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Double scale
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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.