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Finding the Fourth Proportional to 1,409.75, 2,114.63 and 383.75

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Solution

The fourth proportional to 1,409.75, 2,114.63 and 383.75 is: 575.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.75 : 2,114.63 = 383.75 : x
  2. Step 2: Convert to fraction form
    1,409.75/2,114.63 = 383.75/x
  3. Step 3: Cross multiply
    1,409.75x = 2,114.63 × 383.75
  4. Step 4: Simplify right side
    1,409.75x = 811,489.26
  5. Step 5: Solve for x
    x = 811,489.26/1,409.75
  6. Step 6: Final answer
    x = 575.63

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.