Home / 20,738.18-31,118.26-9,639.20

Finding the Fourth Proportional to 20,738.18, 31,118.26 and 9,639.20

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Solution

The fourth proportional to 20,738.18, 31,118.26 and 9,639.20 is: 14,463.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.18 : 31,118.26 = 9,639.20 : x
  2. Step 2: Convert to fraction form
    20,738.18/31,118.26 = 9,639.20/x
  3. Step 3: Cross multiply
    20,738.18x = 31,118.26 × 9,639.20
  4. Step 4: Simplify right side
    20,738.18x = 299,955,131.79
  5. Step 5: Solve for x
    x = 299,955,131.79/20,738.18
  6. Step 6: Final answer
    x = 14,463.91

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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.