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Finding the Fourth Proportional to 704,554,468.80, 972,287,438.85 and 391,288,682.76

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Solution

The fourth proportional to 704,554,468.80, 972,287,438.85 and 391,288,682.76 is: 539,979,643.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    704,554,468.80 : 972,287,438.85 = 391,288,682.76 : x
  2. Step 2: Convert to fraction form
    704,554,468.80/972,287,438.85 = 391,288,682.76/x
  3. Step 3: Cross multiply
    704,554,468.80x = 972,287,438.85 × 391,288,682.76
  4. Step 4: Simplify right side
    704,554,468.80x = 380,445,071,211,710,528
  5. Step 5: Solve for x
    x = 380,445,071,211,710,528/704,554,468.80
  6. Step 6: Final answer
    x = 539,979,643.96

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1.5x scale

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.