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Finding the Fourth Proportional to 138,859.20, 208,288.80 and 45,374.40

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Solution

The fourth proportional to 138,859.20, 208,288.80 and 45,374.40 is: 68,061.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,859.20 : 208,288.80 = 45,374.40 : x
  2. Step 2: Convert to fraction form
    138,859.20/208,288.80 = 45,374.40/x
  3. Step 3: Cross multiply
    138,859.20x = 208,288.80 × 45,374.40
  4. Step 4: Simplify right side
    138,859.20x = 9,450,979,326.72
  5. Step 5: Solve for x
    x = 9,450,979,326.72/138,859.20
  6. Step 6: Final answer
    x = 68,061.60

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1.5x scale

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.