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Finding the Fourth Proportional to 138,319.60, 207,479.40 and 100,703.20

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Solution

The fourth proportional to 138,319.60, 207,479.40 and 100,703.20 is: 151,054.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,319.60 : 207,479.40 = 100,703.20 : x
  2. Step 2: Convert to fraction form
    138,319.60/207,479.40 = 100,703.20/x
  3. Step 3: Cross multiply
    138,319.60x = 207,479.40 × 100,703.20
  4. Step 4: Simplify right side
    138,319.60x = 20,893,839,514.08
  5. Step 5: Solve for x
    x = 20,893,839,514.08/138,319.60
  6. Step 6: Final answer
    x = 151,054.80

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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.