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Finding the Fourth Proportional to 129,393.66, 178,568.49 and 72,035.34

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Solution

The fourth proportional to 129,393.66, 178,568.49 and 72,035.34 is: 99,411.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,393.66 : 178,568.49 = 72,035.34 : x
  2. Step 2: Convert to fraction form
    129,393.66/178,568.49 = 72,035.34/x
  3. Step 3: Cross multiply
    129,393.66x = 178,568.49 × 72,035.34
  4. Step 4: Simplify right side
    129,393.66x = 12,863,241,890.44
  5. Step 5: Solve for x
    x = 12,863,241,890.44/129,393.66
  6. Step 6: Final answer
    x = 99,411.69

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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.