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Finding the Fourth Proportional to 129,258.54, 178,393.80 and 72,680.82

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Solution

The fourth proportional to 129,258.54, 178,393.80 and 72,680.82 is: 100,309.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,258.54 : 178,393.80 = 72,680.82 : x
  2. Step 2: Convert to fraction form
    129,258.54/178,393.80 = 72,680.82/x
  3. Step 3: Cross multiply
    129,258.54x = 178,393.80 × 72,680.82
  4. Step 4: Simplify right side
    129,258.54x = 12,965,807,666.92
  5. Step 5: Solve for x
    x = 12,965,807,666.92/129,258.54
  6. Step 6: Final answer
    x = 100,309.10

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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.