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Finding the Fourth Proportional to 86,630.80, 129,946.20 and 53,242.60

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Solution

The fourth proportional to 86,630.80, 129,946.20 and 53,242.60 is: 79,863.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,630.80 : 129,946.20 = 53,242.60 : x
  2. Step 2: Convert to fraction form
    86,630.80/129,946.20 = 53,242.60/x
  3. Step 3: Cross multiply
    86,630.80x = 129,946.20 × 53,242.60
  4. Step 4: Simplify right side
    86,630.80x = 6,918,673,548.12
  5. Step 5: Solve for x
    x = 6,918,673,548.12/86,630.80
  6. Step 6: Final answer
    x = 79,863.90

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Similar ratio
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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.