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Finding the Fourth Proportional to 708,761,728.94, 978,091,281.67 and 391,222,034.79

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Solution

The fourth proportional to 708,761,728.94, 978,091,281.67 and 391,222,034.79 is: 539,886,460.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,761,728.94 : 978,091,281.67 = 391,222,034.79 : x
  2. Step 2: Convert to fraction form
    708,761,728.94/978,091,281.67 = 391,222,034.79/x
  3. Step 3: Cross multiply
    708,761,728.94x = 978,091,281.67 × 391,222,034.79
  4. Step 4: Simplify right side
    708,761,728.94x = 382,650,861,425,296,448
  5. Step 5: Solve for x
    x = 382,650,861,425,296,448/708,761,728.94
  6. Step 6: Final answer
    x = 539,886,460.85

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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.