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Finding the Fourth Proportional to 28,100.70, 38,781.51 and 15,529.50

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Solution

The fourth proportional to 28,100.70, 38,781.51 and 15,529.50 is: 21,432.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,100.70 : 38,781.51 = 15,529.50 : x
  2. Step 2: Convert to fraction form
    28,100.70/38,781.51 = 15,529.50/x
  3. Step 3: Cross multiply
    28,100.70x = 38,781.51 × 15,529.50
  4. Step 4: Simplify right side
    28,100.70x = 602,257,459.55
  5. Step 5: Solve for x
    x = 602,257,459.55/28,100.70
  6. Step 6: Final answer
    x = 21,432.12

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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.