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Finding the Fourth Proportional to 28,000,581.20, 42,000,871.80 and 20,347,830.80

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Solution

The fourth proportional to 28,000,581.20, 42,000,871.80 and 20,347,830.80 is: 30,521,746.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000,581.20 : 42,000,871.80 = 20,347,830.80 : x
  2. Step 2: Convert to fraction form
    28,000,581.20/42,000,871.80 = 20,347,830.80/x
  3. Step 3: Cross multiply
    28,000,581.20x = 42,000,871.80 × 20,347,830.80
  4. Step 4: Simplify right side
    28,000,581.20x = 854,626,632,838,891.38
  5. Step 5: Solve for x
    x = 854,626,632,838,891.38/28,000,581.20
  6. Step 6: Final answer
    x = 30,521,746.20

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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.