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Finding the Fourth Proportional to 20,644.25, 28,484.88 and 12,572.49

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Solution

The fourth proportional to 20,644.25, 28,484.88 and 12,572.49 is: 17,347.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.25 : 28,484.88 = 12,572.49 : x
  2. Step 2: Convert to fraction form
    20,644.25/28,484.88 = 12,572.49/x
  3. Step 3: Cross multiply
    20,644.25x = 28,484.88 × 12,572.49
  4. Step 4: Simplify right side
    20,644.25x = 358,125,868.95
  5. Step 5: Solve for x
    x = 358,125,868.95/20,644.25
  6. Step 6: Final answer
    x = 17,347.49

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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.