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Finding the Fourth Proportional to 85,419.40, 128,129.10 and 84,107.20

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Solution

The fourth proportional to 85,419.40, 128,129.10 and 84,107.20 is: 126,160.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,419.40 : 128,129.10 = 84,107.20 : x
  2. Step 2: Convert to fraction form
    85,419.40/128,129.10 = 84,107.20/x
  3. Step 3: Cross multiply
    85,419.40x = 128,129.10 × 84,107.20
  4. Step 4: Simplify right side
    85,419.40x = 10,776,579,839.52
  5. Step 5: Solve for x
    x = 10,776,579,839.52/85,419.40
  6. Step 6: Final answer
    x = 126,160.80

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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.