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Finding the Fourth Proportional to 8,615.80, 12,911.40 and 4,910.20

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Solution

The fourth proportional to 8,615.80, 12,911.40 and 4,910.20 is: 7,358.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.80 : 12,911.40 = 4,910.20 : x
  2. Step 2: Convert to fraction form
    8,615.80/12,911.40 = 4,910.20/x
  3. Step 3: Cross multiply
    8,615.80x = 12,911.40 × 4,910.20
  4. Step 4: Simplify right side
    8,615.80x = 63,397,556.28
  5. Step 5: Solve for x
    x = 63,397,556.28/8,615.80
  6. Step 6: Final answer
    x = 7,358.29

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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.