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Finding the Fourth Proportional to 68,990.28, 95,199.42 and 42,139.32

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Solution

The fourth proportional to 68,990.28, 95,199.42 and 42,139.32 is: 58,147.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,990.28 : 95,199.42 = 42,139.32 : x
  2. Step 2: Convert to fraction form
    68,990.28/95,199.42 = 42,139.32/x
  3. Step 3: Cross multiply
    68,990.28x = 95,199.42 × 42,139.32
  4. Step 4: Simplify right side
    68,990.28x = 4,011,638,823.19
  5. Step 5: Solve for x
    x = 4,011,638,823.19/68,990.28
  6. Step 6: Final answer
    x = 58,147.88

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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.