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Finding the Fourth Proportional to 85,981.60, 128,237.33 and 75,520.45

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Solution

The fourth proportional to 85,981.60, 128,237.33 and 75,520.45 is: 112,635.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,981.60 : 128,237.33 = 75,520.45 : x
  2. Step 2: Convert to fraction form
    85,981.60/128,237.33 = 75,520.45/x
  3. Step 3: Cross multiply
    85,981.60x = 128,237.33 × 75,520.45
  4. Step 4: Simplify right side
    85,981.60x = 9,684,540,868.40
  5. Step 5: Solve for x
    x = 9,684,540,868.40/85,981.60
  6. Step 6: Final answer
    x = 112,635.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.