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Finding the Fourth Proportional to 661,780.71, 990,166.05 and 392,053.65

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Solution

The fourth proportional to 661,780.71, 990,166.05 and 392,053.65 is: 586,596.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,780.71 : 990,166.05 = 392,053.65 : x
  2. Step 2: Convert to fraction form
    661,780.71/990,166.05 = 392,053.65/x
  3. Step 3: Cross multiply
    661,780.71x = 990,166.05 × 392,053.65
  4. Step 4: Simplify right side
    661,780.71x = 388,198,214,008.58
  5. Step 5: Solve for x
    x = 388,198,214,008.58/661,780.71
  6. Step 6: Final answer
    x = 586,596.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.