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Finding the Fourth Proportional to 138,878.53, 208,328.60 and 45,393.73

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Solution

The fourth proportional to 138,878.53, 208,328.60 and 45,393.73 is: 68,094.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,878.53 : 208,328.60 = 45,393.73 : x
  2. Step 2: Convert to fraction form
    138,878.53/208,328.60 = 45,393.73/x
  3. Step 3: Cross multiply
    138,878.53x = 208,328.60 × 45,393.73
  4. Step 4: Simplify right side
    138,878.53x = 9,456,812,219.68
  5. Step 5: Solve for x
    x = 9,456,812,219.68/138,878.53
  6. Step 6: Final answer
    x = 68,094.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.