Home / 86,417.28-129,470.40-80,352

Finding the Fourth Proportional to 86,417.28, 129,470.40 and 80,352

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Solution

The fourth proportional to 86,417.28, 129,470.40 and 80,352 is: 120,383.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,417.28 : 129,470.40 = 80,352 : x
  2. Step 2: Convert to fraction form
    86,417.28/129,470.40 = 80,352/x
  3. Step 3: Cross multiply
    86,417.28x = 129,470.40 × 80,352
  4. Step 4: Simplify right side
    86,417.28x = 10,403,205,580.80
  5. Step 5: Solve for x
    x = 10,403,205,580.80/86,417.28
  6. Step 6: Final answer
    x = 120,383.40

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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.