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Finding the Fourth Proportional to 85,432.45, 128,148.68 and 66,684.39

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Solution

The fourth proportional to 85,432.45, 128,148.68 and 66,684.39 is: 100,026.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,432.45 : 128,148.68 = 66,684.39 : x
  2. Step 2: Convert to fraction form
    85,432.45/128,148.68 = 66,684.39/x
  3. Step 3: Cross multiply
    85,432.45x = 128,148.68 × 66,684.39
  4. Step 4: Simplify right side
    85,432.45x = 8,545,516,601.68
  5. Step 5: Solve for x
    x = 8,545,516,601.68/85,432.45
  6. Step 6: Final answer
    x = 100,026.59

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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.