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Finding the Fourth Proportional to 80,663.60, 121,031.40 and 28,110.80

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Solution

The fourth proportional to 80,663.60, 121,031.40 and 28,110.80 is: 42,178.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,663.60 : 121,031.40 = 28,110.80 : x
  2. Step 2: Convert to fraction form
    80,663.60/121,031.40 = 28,110.80/x
  3. Step 3: Cross multiply
    80,663.60x = 121,031.40 × 28,110.80
  4. Step 4: Simplify right side
    80,663.60x = 3,402,289,479.12
  5. Step 5: Solve for x
    x = 3,402,289,479.12/80,663.60
  6. Step 6: Final answer
    x = 42,178.75

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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.