Home / 129,009.16-178,031.94-72,420.52

Finding the Fourth Proportional to 129,009.16, 178,031.94 and 72,420.52

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Solution

The fourth proportional to 129,009.16, 178,031.94 and 72,420.52 is: 99,939.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,009.16 : 178,031.94 = 72,420.52 : x
  2. Step 2: Convert to fraction form
    129,009.16/178,031.94 = 72,420.52/x
  3. Step 3: Cross multiply
    129,009.16x = 178,031.94 × 72,420.52
  4. Step 4: Simplify right side
    129,009.16x = 12,893,165,671.41
  5. Step 5: Solve for x
    x = 12,893,165,671.41/129,009.16
  6. Step 6: Final answer
    x = 99,939.92

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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.