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Finding the Fourth Proportional to 100,469.28, 138,623.76 and 64,670.88

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Solution

The fourth proportional to 100,469.28, 138,623.76 and 64,670.88 is: 89,230.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,469.28 : 138,623.76 = 64,670.88 : x
  2. Step 2: Convert to fraction form
    100,469.28/138,623.76 = 64,670.88/x
  3. Step 3: Cross multiply
    100,469.28x = 138,623.76 × 64,670.88
  4. Step 4: Simplify right side
    100,469.28x = 8,964,920,548.11
  5. Step 5: Solve for x
    x = 8,964,920,548.11/100,469.28
  6. Step 6: Final answer
    x = 89,230.46

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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.