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Finding the Fourth Proportional to 68,990.78, 95,210.66 and 42,128.96

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Solution

The fourth proportional to 68,990.78, 95,210.66 and 42,128.96 is: 58,140.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,990.78 : 95,210.66 = 42,128.96 : x
  2. Step 2: Convert to fraction form
    68,990.78/95,210.66 = 42,128.96/x
  3. Step 3: Cross multiply
    68,990.78x = 95,210.66 × 42,128.96
  4. Step 4: Simplify right side
    68,990.78x = 4,011,126,086.71
  5. Step 5: Solve for x
    x = 4,011,126,086.71/68,990.78
  6. Step 6: Final answer
    x = 58,140.03

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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.