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Finding the Fourth Proportional to 20,695.40, 31,043.10 and 8,218.40

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Solution

The fourth proportional to 20,695.40, 31,043.10 and 8,218.40 is: 12,327.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,695.40 : 31,043.10 = 8,218.40 : x
  2. Step 2: Convert to fraction form
    20,695.40/31,043.10 = 8,218.40/x
  3. Step 3: Cross multiply
    20,695.40x = 31,043.10 × 8,218.40
  4. Step 4: Simplify right side
    20,695.40x = 255,124,613.04
  5. Step 5: Solve for x
    x = 255,124,613.04/20,695.40
  6. Step 6: Final answer
    x = 12,327.60

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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.