Home / 85,434.10-128,151.15-81,351.70

Finding the Fourth Proportional to 85,434.10, 128,151.15 and 81,351.70

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Solution

The fourth proportional to 85,434.10, 128,151.15 and 81,351.70 is: 122,027.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,434.10 : 128,151.15 = 81,351.70 : x
  2. Step 2: Convert to fraction form
    85,434.10/128,151.15 = 81,351.70/x
  3. Step 3: Cross multiply
    85,434.10x = 128,151.15 × 81,351.70
  4. Step 4: Simplify right side
    85,434.10x = 10,425,313,909.46
  5. Step 5: Solve for x
    x = 10,425,313,909.46/85,434.10
  6. Step 6: Final answer
    x = 122,027.55

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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.