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Finding the Fourth Proportional to 42,472.85, 63,709.65 and 12,890.69

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Solution

The fourth proportional to 42,472.85, 63,709.65 and 12,890.69 is: 19,336.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,472.85 : 63,709.65 = 12,890.69 : x
  2. Step 2: Convert to fraction form
    42,472.85/63,709.65 = 12,890.69/x
  3. Step 3: Cross multiply
    42,472.85x = 63,709.65 × 12,890.69
  4. Step 4: Simplify right side
    42,472.85x = 821,261,029.61
  5. Step 5: Solve for x
    x = 821,261,029.61/42,472.85
  6. Step 6: Final answer
    x = 19,336.14

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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.