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Finding the Fourth Proportional to 129,013.08, 178,055.08 and 72,424.46

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Solution

The fourth proportional to 129,013.08, 178,055.08 and 72,424.46 is: 99,955.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,013.08 : 178,055.08 = 72,424.46 : x
  2. Step 2: Convert to fraction form
    129,013.08/178,055.08 = 72,424.46/x
  3. Step 3: Cross multiply
    129,013.08x = 178,055.08 × 72,424.46
  4. Step 4: Simplify right side
    129,013.08x = 12,895,543,019.26
  5. Step 5: Solve for x
    x = 12,895,543,019.26/129,013.08
  6. Step 6: Final answer
    x = 99,955.31

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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.