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Finding the Fourth Proportional to 42,979,807.20, 64,469,710.80 and 25,761,118.80

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Solution

The fourth proportional to 42,979,807.20, 64,469,710.80 and 25,761,118.80 is: 38,641,678.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,979,807.20 : 64,469,710.80 = 25,761,118.80 : x
  2. Step 2: Convert to fraction form
    42,979,807.20/64,469,710.80 = 25,761,118.80/x
  3. Step 3: Cross multiply
    42,979,807.20x = 64,469,710.80 × 25,761,118.80
  4. Step 4: Simplify right side
    42,979,807.20x = 1,660,811,878,920,443
  5. Step 5: Solve for x
    x = 1,660,811,878,920,443/42,979,807.20
  6. Step 6: Final answer
    x = 38,641,678.20

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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.