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Finding the Fourth Proportional to 80,881.80, 121,322.70 and 51,430.20

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Solution

The fourth proportional to 80,881.80, 121,322.70 and 51,430.20 is: 77,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,881.80 : 121,322.70 = 51,430.20 : x
  2. Step 2: Convert to fraction form
    80,881.80/121,322.70 = 51,430.20/x
  3. Step 3: Cross multiply
    80,881.80x = 121,322.70 × 51,430.20
  4. Step 4: Simplify right side
    80,881.80x = 6,239,650,725.54
  5. Step 5: Solve for x
    x = 6,239,650,725.54/80,881.80
  6. Step 6: Final answer
    x = 77,145.30

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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.