Home / 21,188.55-31,774.70-7,144.79

Finding the Fourth Proportional to 21,188.55, 31,774.70 and 7,144.79

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Solution

The fourth proportional to 21,188.55, 31,774.70 and 7,144.79 is: 10,714.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,188.55 : 31,774.70 = 7,144.79 : x
  2. Step 2: Convert to fraction form
    21,188.55/31,774.70 = 7,144.79/x
  3. Step 3: Cross multiply
    21,188.55x = 31,774.70 × 7,144.79
  4. Step 4: Simplify right side
    21,188.55x = 227,023,417.80
  5. Step 5: Solve for x
    x = 227,023,417.80/21,188.55
  6. Step 6: Final answer
    x = 10,714.44

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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.