Home / 15,499.90-21,390.30-8,785.25

Finding the Fourth Proportional to 15,499.90, 21,390.30 and 8,785.25

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Solution

The fourth proportional to 15,499.90, 21,390.30 and 8,785.25 is: 12,123.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,499.90 : 21,390.30 = 8,785.25 : x
  2. Step 2: Convert to fraction form
    15,499.90/21,390.30 = 8,785.25/x
  3. Step 3: Cross multiply
    15,499.90x = 21,390.30 × 8,785.25
  4. Step 4: Simplify right side
    15,499.90x = 187,919,186.55
  5. Step 5: Solve for x
    x = 187,919,186.55/15,499.90
  6. Step 6: Final answer
    x = 12,123.90

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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.