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Finding the Fourth Proportional to 20,712.80, 31,073.20 and 8,866.40

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Solution

The fourth proportional to 20,712.80, 31,073.20 and 8,866.40 is: 13,301.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.80 : 31,073.20 = 8,866.40 : x
  2. Step 2: Convert to fraction form
    20,712.80/31,073.20 = 8,866.40/x
  3. Step 3: Cross multiply
    20,712.80x = 31,073.20 × 8,866.40
  4. Step 4: Simplify right side
    20,712.80x = 275,507,420.48
  5. Step 5: Solve for x
    x = 275,507,420.48/20,712.80
  6. Step 6: Final answer
    x = 13,301.31

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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.