Home / 20,488.40-30,742.20-10,638.80

Finding the Fourth Proportional to 20,488.40, 30,742.20 and 10,638.80

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Solution

The fourth proportional to 20,488.40, 30,742.20 and 10,638.80 is: 15,963.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,488.40 : 30,742.20 = 10,638.80 : x
  2. Step 2: Convert to fraction form
    20,488.40/30,742.20 = 10,638.80/x
  3. Step 3: Cross multiply
    20,488.40x = 30,742.20 × 10,638.80
  4. Step 4: Simplify right side
    20,488.40x = 327,060,117.36
  5. Step 5: Solve for x
    x = 327,060,117.36/20,488.40
  6. Step 6: Final answer
    x = 15,963.18

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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.