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Finding the Fourth Proportional to 100,168.53, 138,326.39 and 64,420.80

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Solution

The fourth proportional to 100,168.53, 138,326.39 and 64,420.80 is: 88,961.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,168.53 : 138,326.39 = 64,420.80 : x
  2. Step 2: Convert to fraction form
    100,168.53/138,326.39 = 64,420.80/x
  3. Step 3: Cross multiply
    100,168.53x = 138,326.39 × 64,420.80
  4. Step 4: Simplify right side
    100,168.53x = 8,911,096,382.81
  5. Step 5: Solve for x
    x = 8,911,096,382.81/100,168.53
  6. Step 6: Final answer
    x = 88,961.04

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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.