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Finding the Fourth Proportional to 709,405.18, 978,999.92 and 387,136.04

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Solution

The fourth proportional to 709,405.18, 978,999.92 and 387,136.04 is: 534,259.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,405.18 : 978,999.92 = 387,136.04 : x
  2. Step 2: Convert to fraction form
    709,405.18/978,999.92 = 387,136.04/x
  3. Step 3: Cross multiply
    709,405.18x = 978,999.92 × 387,136.04
  4. Step 4: Simplify right side
    709,405.18x = 379,006,152,189.12
  5. Step 5: Solve for x
    x = 379,006,152,189.12/709,405.18
  6. Step 6: Final answer
    x = 534,259.07

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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.