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Finding the Fourth Proportional to 42,572.82, 63,869.16 and 12,990.60

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Solution

The fourth proportional to 42,572.82, 63,869.16 and 12,990.60 is: 19,488.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,572.82 : 63,869.16 = 12,990.60 : x
  2. Step 2: Convert to fraction form
    42,572.82/63,869.16 = 12,990.60/x
  3. Step 3: Cross multiply
    42,572.82x = 63,869.16 × 12,990.60
  4. Step 4: Simplify right side
    42,572.82x = 829,698,709.90
  5. Step 5: Solve for x
    x = 829,698,709.90/42,572.82
  6. Step 6: Final answer
    x = 19,488.93

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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.