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Finding the Fourth Proportional to 917.88, 1,265.99 and 638.13

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Solution

The fourth proportional to 917.88, 1,265.99 and 638.13 is: 880.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.88 : 1,265.99 = 638.13 : x
  2. Step 2: Convert to fraction form
    917.88/1,265.99 = 638.13/x
  3. Step 3: Cross multiply
    917.88x = 1,265.99 × 638.13
  4. Step 4: Simplify right side
    917.88x = 807,863.01
  5. Step 5: Solve for x
    x = 807,863.01/917.88
  6. Step 6: Final answer
    x = 880.14

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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.