Home / 129,708.17-178,981.36-72,334.05

Finding the Fourth Proportional to 129,708.17, 178,981.36 and 72,334.05

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Solution

The fourth proportional to 129,708.17, 178,981.36 and 72,334.05 is: 99,812.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,708.17 : 178,981.36 = 72,334.05 : x
  2. Step 2: Convert to fraction form
    129,708.17/178,981.36 = 72,334.05/x
  3. Step 3: Cross multiply
    129,708.17x = 178,981.36 × 72,334.05
  4. Step 4: Simplify right side
    129,708.17x = 12,946,446,643.31
  5. Step 5: Solve for x
    x = 12,946,446,643.31/129,708.17
  6. Step 6: Final answer
    x = 99,812.11

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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.