Home / 129,699.72-178,985.19-72,339.09

Finding the Fourth Proportional to 129,699.72, 178,985.19 and 72,339.09

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Solution

The fourth proportional to 129,699.72, 178,985.19 and 72,339.09 is: 99,827.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,699.72 : 178,985.19 = 72,339.09 : x
  2. Step 2: Convert to fraction form
    129,699.72/178,985.19 = 72,339.09/x
  3. Step 3: Cross multiply
    129,699.72x = 178,985.19 × 72,339.09
  4. Step 4: Simplify right side
    129,699.72x = 12,947,625,768.08
  5. Step 5: Solve for x
    x = 12,947,625,768.08/129,699.72
  6. Step 6: Final answer
    x = 99,827.71

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1.5x scale

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.