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Finding the Fourth Proportional to 81,281.80, 121,749.90 and 53,288.20

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Solution

The fourth proportional to 81,281.80, 121,749.90 and 53,288.20 is: 79,819.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.80 : 121,749.90 = 53,288.20 : x
  2. Step 2: Convert to fraction form
    81,281.80/121,749.90 = 53,288.20/x
  3. Step 3: Cross multiply
    81,281.80x = 121,749.90 × 53,288.20
  4. Step 4: Simplify right side
    81,281.80x = 6,487,833,021.18
  5. Step 5: Solve for x
    x = 6,487,833,021.18/81,281.80
  6. Step 6: Final answer
    x = 79,819.01

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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.