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Finding the Fourth Proportional to 1,387.17, 1,913.69 and 938.88

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Solution

The fourth proportional to 1,387.17, 1,913.69 and 938.88 is: 1,295.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.17 : 1,913.69 = 938.88 : x
  2. Step 2: Convert to fraction form
    1,387.17/1,913.69 = 938.88/x
  3. Step 3: Cross multiply
    1,387.17x = 1,913.69 × 938.88
  4. Step 4: Simplify right side
    1,387.17x = 1,796,720.57
  5. Step 5: Solve for x
    x = 1,796,720.57/1,387.17
  6. Step 6: Final answer
    x = 1,295.24

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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.