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Finding the Fourth Proportional to 137,319.60, 205,979.40 and 99,703.20

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Solution

The fourth proportional to 137,319.60, 205,979.40 and 99,703.20 is: 149,554.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,319.60 : 205,979.40 = 99,703.20 : x
  2. Step 2: Convert to fraction form
    137,319.60/205,979.40 = 99,703.20/x
  3. Step 3: Cross multiply
    137,319.60x = 205,979.40 × 99,703.20
  4. Step 4: Simplify right side
    137,319.60x = 20,536,805,314.08
  5. Step 5: Solve for x
    x = 20,536,805,314.08/137,319.60
  6. Step 6: Final answer
    x = 149,554.80

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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.