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Finding the Fourth Proportional to 709,396.31, 978,987.67 and 387,127.17

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Solution

The fourth proportional to 709,396.31, 978,987.67 and 387,127.17 is: 534,246.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,396.31 : 978,987.67 = 387,127.17 : x
  2. Step 2: Convert to fraction form
    709,396.31/978,987.67 = 387,127.17/x
  3. Step 3: Cross multiply
    709,396.31x = 978,987.67 × 387,127.17
  4. Step 4: Simplify right side
    709,396.31x = 378,992,726,151.99
  5. Step 5: Solve for x
    x = 378,992,726,151.99/709,396.31
  6. Step 6: Final answer
    x = 534,246.82

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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.