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Finding the Fourth Proportional to 931.59, 1,397.39 and 383.40

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Solution

The fourth proportional to 931.59, 1,397.39 and 383.40 is: 575.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.59 : 1,397.39 = 383.40 : x
  2. Step 2: Convert to fraction form
    931.59/1,397.39 = 383.40/x
  3. Step 3: Cross multiply
    931.59x = 1,397.39 × 383.40
  4. Step 4: Simplify right side
    931.59x = 535,757.41
  5. Step 5: Solve for x
    x = 535,757.41/931.59
  6. Step 6: Final answer
    x = 575.10

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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.