Home / 15,493.60-21,381.20-8,779.68

Finding the Fourth Proportional to 15,493.60, 21,381.20 and 8,779.68

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Solution

The fourth proportional to 15,493.60, 21,381.20 and 8,779.68 is: 12,115.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,493.60 : 21,381.20 = 8,779.68 : x
  2. Step 2: Convert to fraction form
    15,493.60/21,381.20 = 8,779.68/x
  3. Step 3: Cross multiply
    15,493.60x = 21,381.20 × 8,779.68
  4. Step 4: Simplify right side
    15,493.60x = 187,720,094.02
  5. Step 5: Solve for x
    x = 187,720,094.02/15,493.60
  6. Step 6: Final answer
    x = 12,115.98

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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.