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Finding the Fourth Proportional to 20,679.61, 28,537.95 and 11,248.15

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Solution

The fourth proportional to 20,679.61, 28,537.95 and 11,248.15 is: 15,522.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.61 : 28,537.95 = 11,248.15 : x
  2. Step 2: Convert to fraction form
    20,679.61/28,537.95 = 11,248.15/x
  3. Step 3: Cross multiply
    20,679.61x = 28,537.95 × 11,248.15
  4. Step 4: Simplify right side
    20,679.61x = 320,999,142.29
  5. Step 5: Solve for x
    x = 320,999,142.29/20,679.61
  6. Step 6: Final answer
    x = 15,522.49

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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.