Home / 129,188.79-178,288.55-71,828.57

Finding the Fourth Proportional to 129,188.79, 178,288.55 and 71,828.57

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Solution

The fourth proportional to 129,188.79, 178,288.55 and 71,828.57 is: 99,127.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,188.79 : 178,288.55 = 71,828.57 : x
  2. Step 2: Convert to fraction form
    129,188.79/178,288.55 = 71,828.57/x
  3. Step 3: Cross multiply
    129,188.79x = 178,288.55 × 71,828.57
  4. Step 4: Simplify right side
    129,188.79x = 12,806,210,343.29
  5. Step 5: Solve for x
    x = 12,806,210,343.29/129,188.79
  6. Step 6: Final answer
    x = 99,127.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.