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Finding the Fourth Proportional to 704,554,470.80, 972,287,441.61 and 391,288,684.76

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Solution

The fourth proportional to 704,554,470.80, 972,287,441.61 and 391,288,684.76 is: 539,979,646.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    704,554,470.80 : 972,287,441.61 = 391,288,684.76 : x
  2. Step 2: Convert to fraction form
    704,554,470.80/972,287,441.61 = 391,288,684.76/x
  3. Step 3: Cross multiply
    704,554,470.80x = 972,287,441.61 × 391,288,684.76
  4. Step 4: Simplify right side
    704,554,470.80x = 380,445,074,236,242,176
  5. Step 5: Solve for x
    x = 380,445,074,236,242,176/704,554,470.80
  6. Step 6: Final answer
    x = 539,979,646.72

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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.