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Finding the Fourth Proportional to 709,156.72, 978,560.80 and 399,053.89

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Solution

The fourth proportional to 709,156.72, 978,560.80 and 399,053.89 is: 550,651.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,156.72 : 978,560.80 = 399,053.89 : x
  2. Step 2: Convert to fraction form
    709,156.72/978,560.80 = 399,053.89/x
  3. Step 3: Cross multiply
    709,156.72x = 978,560.80 × 399,053.89
  4. Step 4: Simplify right side
    709,156.72x = 390,498,488,948.71
  5. Step 5: Solve for x
    x = 390,498,488,948.71/709,156.72
  6. Step 6: Final answer
    x = 550,651.89

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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.