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Finding the Fourth Proportional to 80,748.40, 121,106.40 and 38,628.40

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Solution

The fourth proportional to 80,748.40, 121,106.40 and 38,628.40 is: 57,934.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,748.40 : 121,106.40 = 38,628.40 : x
  2. Step 2: Convert to fraction form
    80,748.40/121,106.40 = 38,628.40/x
  3. Step 3: Cross multiply
    80,748.40x = 121,106.40 × 38,628.40
  4. Step 4: Simplify right side
    80,748.40x = 4,678,146,461.76
  5. Step 5: Solve for x
    x = 4,678,146,461.76/80,748.40
  6. Step 6: Final answer
    x = 57,934.85

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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.