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Finding the Fourth Proportional to 28,086.28, 42,129.42 and 8,364.76

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Solution

The fourth proportional to 28,086.28, 42,129.42 and 8,364.76 is: 12,547.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,086.28 : 42,129.42 = 8,364.76 : x
  2. Step 2: Convert to fraction form
    28,086.28/42,129.42 = 8,364.76/x
  3. Step 3: Cross multiply
    28,086.28x = 42,129.42 × 8,364.76
  4. Step 4: Simplify right side
    28,086.28x = 352,402,487.24
  5. Step 5: Solve for x
    x = 352,402,487.24/28,086.28
  6. Step 6: Final answer
    x = 12,547.14

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.