Home / 129,709.61-178,983.35-72,335.49

Finding the Fourth Proportional to 129,709.61, 178,983.35 and 72,335.49

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Solution

The fourth proportional to 129,709.61, 178,983.35 and 72,335.49 is: 99,814.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,709.61 : 178,983.35 = 72,335.49 : x
  2. Step 2: Convert to fraction form
    129,709.61/178,983.35 = 72,335.49/x
  3. Step 3: Cross multiply
    129,709.61x = 178,983.35 × 72,335.49
  4. Step 4: Simplify right side
    129,709.61x = 12,946,847,962.41
  5. Step 5: Solve for x
    x = 12,946,847,962.41/129,709.61
  6. Step 6: Final answer
    x = 99,814.10

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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.