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Finding the Fourth Proportional to 99,810.20, 149,715.30 and 71,670.80

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Solution

The fourth proportional to 99,810.20, 149,715.30 and 71,670.80 is: 107,506.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,810.20 : 149,715.30 = 71,670.80 : x
  2. Step 2: Convert to fraction form
    99,810.20/149,715.30 = 71,670.80/x
  3. Step 3: Cross multiply
    99,810.20x = 149,715.30 × 71,670.80
  4. Step 4: Simplify right side
    99,810.20x = 10,730,215,323.24
  5. Step 5: Solve for x
    x = 10,730,215,323.24/99,810.20
  6. Step 6: Final answer
    x = 107,506.20

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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.