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Finding the Fourth Proportional to 85,812.80, 128,719.20 and 81,001.40

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Solution

The fourth proportional to 85,812.80, 128,719.20 and 81,001.40 is: 121,502.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.80 : 128,719.20 = 81,001.40 : x
  2. Step 2: Convert to fraction form
    85,812.80/128,719.20 = 81,001.40/x
  3. Step 3: Cross multiply
    85,812.80x = 128,719.20 × 81,001.40
  4. Step 4: Simplify right side
    85,812.80x = 10,426,435,406.88
  5. Step 5: Solve for x
    x = 10,426,435,406.88/85,812.80
  6. Step 6: Final answer
    x = 121,502.10

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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.