Home / 21,189.15-31,779.68-6,398.55

Finding the Fourth Proportional to 21,189.15, 31,779.68 and 6,398.55

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Solution

The fourth proportional to 21,189.15, 31,779.68 and 6,398.55 is: 9,596.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.15 : 31,779.68 = 6,398.55 : x
  2. Step 2: Convert to fraction form
    21,189.15/31,779.68 = 6,398.55/x
  3. Step 3: Cross multiply
    21,189.15x = 31,779.68 × 6,398.55
  4. Step 4: Simplify right side
    21,189.15x = 203,343,839.47
  5. Step 5: Solve for x
    x = 203,343,839.47/21,189.15
  6. Step 6: Final answer
    x = 9,596.60

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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.