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Finding the Fourth Proportional to 129,494.56, 178,803.84 and 101,280.64

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Solution

The fourth proportional to 129,494.56, 178,803.84 and 101,280.64 is: 139,846.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,494.56 : 178,803.84 = 101,280.64 : x
  2. Step 2: Convert to fraction form
    129,494.56/178,803.84 = 101,280.64/x
  3. Step 3: Cross multiply
    129,494.56x = 178,803.84 × 101,280.64
  4. Step 4: Simplify right side
    129,494.56x = 18,109,367,349.66
  5. Step 5: Solve for x
    x = 18,109,367,349.66/129,494.56
  6. Step 6: Final answer
    x = 139,846.55

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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.