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Finding the Fourth Proportional to 709,020.78, 978,451.73 and 386,737.80

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Solution

The fourth proportional to 709,020.78, 978,451.73 and 386,737.80 is: 533,699.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,020.78 : 978,451.73 = 386,737.80 : x
  2. Step 2: Convert to fraction form
    709,020.78/978,451.73 = 386,737.80/x
  3. Step 3: Cross multiply
    709,020.78x = 978,451.73 × 386,737.80
  4. Step 4: Simplify right side
    709,020.78x = 378,404,267,532.71
  5. Step 5: Solve for x
    x = 378,404,267,532.71/709,020.78
  6. Step 6: Final answer
    x = 533,699.83

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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.