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Finding the Fourth Proportional to 85,545.40, 128,123.70 and 54,052.60

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Solution

The fourth proportional to 85,545.40, 128,123.70 and 54,052.60 is: 80,956.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,545.40 : 128,123.70 = 54,052.60 : x
  2. Step 2: Convert to fraction form
    85,545.40/128,123.70 = 54,052.60/x
  3. Step 3: Cross multiply
    85,545.40x = 128,123.70 × 54,052.60
  4. Step 4: Simplify right side
    85,545.40x = 6,925,419,106.62
  5. Step 5: Solve for x
    x = 6,925,419,106.62/85,545.40
  6. Step 6: Final answer
    x = 80,956.07

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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.