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Finding the Fourth Proportional to 21,572.61, 29,770.80 and 12,141.51

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Solution

The fourth proportional to 21,572.61, 29,770.80 and 12,141.51 is: 16,755.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,572.61 : 29,770.80 = 12,141.51 : x
  2. Step 2: Convert to fraction form
    21,572.61/29,770.80 = 12,141.51/x
  3. Step 3: Cross multiply
    21,572.61x = 29,770.80 × 12,141.51
  4. Step 4: Simplify right side
    21,572.61x = 361,462,465.91
  5. Step 5: Solve for x
    x = 361,462,465.91/21,572.61
  6. Step 6: Final answer
    x = 16,755.62

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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.