Home / 20,915.40-31,366.46-6,872.13

Finding the Fourth Proportional to 20,915.40, 31,366.46 and 6,872.13

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Solution

The fourth proportional to 20,915.40, 31,366.46 and 6,872.13 is: 10,306.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.40 : 31,366.46 = 6,872.13 : x
  2. Step 2: Convert to fraction form
    20,915.40/31,366.46 = 6,872.13/x
  3. Step 3: Cross multiply
    20,915.40x = 31,366.46 × 6,872.13
  4. Step 4: Simplify right side
    20,915.40x = 215,554,390.76
  5. Step 5: Solve for x
    x = 215,554,390.76/20,915.40
  6. Step 6: Final answer
    x = 10,306.01

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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.