Home / 20,868.30-28,799.81-12,915.15

Finding the Fourth Proportional to 20,868.30, 28,799.81 and 12,915.15

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Solution

The fourth proportional to 20,868.30, 28,799.81 and 12,915.15 is: 17,823.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.30 : 28,799.81 = 12,915.15 : x
  2. Step 2: Convert to fraction form
    20,868.30/28,799.81 = 12,915.15/x
  3. Step 3: Cross multiply
    20,868.30x = 28,799.81 × 12,915.15
  4. Step 4: Simplify right side
    20,868.30x = 371,953,801.55
  5. Step 5: Solve for x
    x = 371,953,801.55/20,868.30
  6. Step 6: Final answer
    x = 17,823.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.