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Finding the Fourth Proportional to 85,877.80, 128,452.20 and 77,056.90

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Solution

The fourth proportional to 85,877.80, 128,452.20 and 77,056.90 is: 115,258.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,877.80 : 128,452.20 = 77,056.90 : x
  2. Step 2: Convert to fraction form
    85,877.80/128,452.20 = 77,056.90/x
  3. Step 3: Cross multiply
    85,877.80x = 128,452.20 × 77,056.90
  4. Step 4: Simplify right side
    85,877.80x = 9,898,128,330.18
  5. Step 5: Solve for x
    x = 9,898,128,330.18/85,877.80
  6. Step 6: Final answer
    x = 115,258.29

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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.