Home / 86,839.72-129,479.20-79,425.68

Finding the Fourth Proportional to 86,839.72, 129,479.20 and 79,425.68

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Solution

The fourth proportional to 86,839.72, 129,479.20 and 79,425.68 is: 118,424.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,839.72 : 129,479.20 = 79,425.68 : x
  2. Step 2: Convert to fraction form
    86,839.72/129,479.20 = 79,425.68/x
  3. Step 3: Cross multiply
    86,839.72x = 129,479.20 × 79,425.68
  4. Step 4: Simplify right side
    86,839.72x = 10,283,973,505.86
  5. Step 5: Solve for x
    x = 10,283,973,505.86/86,839.72
  6. Step 6: Final answer
    x = 118,424.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.