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Finding the Fourth Proportional to 709,345.20, 978,910.44 and 387,064.08

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Solution

The fourth proportional to 709,345.20, 978,910.44 and 387,064.08 is: 534,156.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,345.20 : 978,910.44 = 387,064.08 : x
  2. Step 2: Convert to fraction form
    709,345.20/978,910.44 = 387,064.08/x
  3. Step 3: Cross multiply
    709,345.20x = 978,910.44 × 387,064.08
  4. Step 4: Simplify right side
    709,345.20x = 378,901,068,861.00
  5. Step 5: Solve for x
    x = 378,901,068,861.00/709,345.20
  6. Step 6: Final answer
    x = 534,156.10

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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.