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Finding the Fourth Proportional to 207,429.20, 310,925.10 and 81,020.60

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Solution

The fourth proportional to 207,429.20, 310,925.10 and 81,020.60 is: 121,445.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,429.20 : 310,925.10 = 81,020.60 : x
  2. Step 2: Convert to fraction form
    207,429.20/310,925.10 = 81,020.60/x
  3. Step 3: Cross multiply
    207,429.20x = 310,925.10 × 81,020.60
  4. Step 4: Simplify right side
    207,429.20x = 25,191,338,157.06
  5. Step 5: Solve for x
    x = 25,191,338,157.06/207,429.20
  6. Step 6: Final answer
    x = 121,445.48

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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.