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Finding the Fourth Proportional to 931.43, 1,397.14 and 418.07

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Solution

The fourth proportional to 931.43, 1,397.14 and 418.07 is: 627.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.43 : 1,397.14 = 418.07 : x
  2. Step 2: Convert to fraction form
    931.43/1,397.14 = 418.07/x
  3. Step 3: Cross multiply
    931.43x = 1,397.14 × 418.07
  4. Step 4: Simplify right side
    931.43x = 584,093.24
  5. Step 5: Solve for x
    x = 584,093.24/931.43
  6. Step 6: Final answer
    x = 627.10

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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.