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Finding the Fourth Proportional to 138,602.80, 207,758.40 and 54,330.40

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Solution

The fourth proportional to 138,602.80, 207,758.40 and 54,330.40 is: 81,438.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,602.80 : 207,758.40 = 54,330.40 : x
  2. Step 2: Convert to fraction form
    138,602.80/207,758.40 = 54,330.40/x
  3. Step 3: Cross multiply
    138,602.80x = 207,758.40 × 54,330.40
  4. Step 4: Simplify right side
    138,602.80x = 11,287,596,975.36
  5. Step 5: Solve for x
    x = 11,287,596,975.36/138,602.80
  6. Step 6: Final answer
    x = 81,438.45

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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.