Home / 129,509.93-178,721.01-72,149.18

Finding the Fourth Proportional to 129,509.93, 178,721.01 and 72,149.18

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Solution

The fourth proportional to 129,509.93, 178,721.01 and 72,149.18 is: 99,564.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,509.93 : 178,721.01 = 72,149.18 : x
  2. Step 2: Convert to fraction form
    129,509.93/178,721.01 = 72,149.18/x
  3. Step 3: Cross multiply
    129,509.93x = 178,721.01 × 72,149.18
  4. Step 4: Simplify right side
    129,509.93x = 12,894,573,426.67
  5. Step 5: Solve for x
    x = 12,894,573,426.67/129,509.93
  6. Step 6: Final answer
    x = 99,564.36

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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.