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Finding the Fourth Proportional to 28,211.76, 38,931.84 and 15,636.24

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Solution

The fourth proportional to 28,211.76, 38,931.84 and 15,636.24 is: 21,577.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,211.76 : 38,931.84 = 15,636.24 : x
  2. Step 2: Convert to fraction form
    28,211.76/38,931.84 = 15,636.24/x
  3. Step 3: Cross multiply
    28,211.76x = 38,931.84 × 15,636.24
  4. Step 4: Simplify right side
    28,211.76x = 608,747,593.88
  5. Step 5: Solve for x
    x = 608,747,593.88/28,211.76
  6. Step 6: Final answer
    x = 21,577.80

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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.