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Finding the Fourth Proportional to 81,497.40, 122,173.20 and 53,430.90

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Solution

The fourth proportional to 81,497.40, 122,173.20 and 53,430.90 is: 80,098.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,497.40 : 122,173.20 = 53,430.90 : x
  2. Step 2: Convert to fraction form
    81,497.40/122,173.20 = 53,430.90/x
  3. Step 3: Cross multiply
    81,497.40x = 122,173.20 × 53,430.90
  4. Step 4: Simplify right side
    81,497.40x = 6,527,824,031.88
  5. Step 5: Solve for x
    x = 6,527,824,031.88/81,497.40
  6. Step 6: Final answer
    x = 80,098.56

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1.5x scale

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.