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Finding the Fourth Proportional to 28,232.80, 38,961.65 and 15,487.20

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Solution

The fourth proportional to 28,232.80, 38,961.65 and 15,487.20 is: 21,372.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,232.80 : 38,961.65 = 15,487.20 : x
  2. Step 2: Convert to fraction form
    28,232.80/38,961.65 = 15,487.20/x
  3. Step 3: Cross multiply
    28,232.80x = 38,961.65 × 15,487.20
  4. Step 4: Simplify right side
    28,232.80x = 603,406,904.60
  5. Step 5: Solve for x
    x = 603,406,904.60/28,232.80
  6. Step 6: Final answer
    x = 21,372.55

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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.