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Finding the Fourth Proportional to 85,367.76, 128,024.12 and 28,426.52

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Solution

The fourth proportional to 85,367.76, 128,024.12 and 28,426.52 is: 42,630.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,367.76 : 128,024.12 = 28,426.52 : x
  2. Step 2: Convert to fraction form
    85,367.76/128,024.12 = 28,426.52/x
  3. Step 3: Cross multiply
    85,367.76x = 128,024.12 × 28,426.52
  4. Step 4: Simplify right side
    85,367.76x = 3,639,280,207.66
  5. Step 5: Solve for x
    x = 3,639,280,207.66/85,367.76
  6. Step 6: Final answer
    x = 42,630.62

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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.