Home / 21,138.80-31,708.20-6,347.84

Finding the Fourth Proportional to 21,138.80, 31,708.20 and 6,347.84

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Solution

The fourth proportional to 21,138.80, 31,708.20 and 6,347.84 is: 9,521.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.80 : 31,708.20 = 6,347.84 : x
  2. Step 2: Convert to fraction form
    21,138.80/31,708.20 = 6,347.84/x
  3. Step 3: Cross multiply
    21,138.80x = 31,708.20 × 6,347.84
  4. Step 4: Simplify right side
    21,138.80x = 201,278,580.29
  5. Step 5: Solve for x
    x = 201,278,580.29/21,138.80
  6. Step 6: Final answer
    x = 9,521.76

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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.