Home / 21,000.15-31,500.23-20,635.65

Finding the Fourth Proportional to 21,000.15, 31,500.23 and 20,635.65

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Solution

The fourth proportional to 21,000.15, 31,500.23 and 20,635.65 is: 30,953.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.15 : 31,500.23 = 20,635.65 : x
  2. Step 2: Convert to fraction form
    21,000.15/31,500.23 = 20,635.65/x
  3. Step 3: Cross multiply
    21,000.15x = 31,500.23 × 20,635.65
  4. Step 4: Simplify right side
    21,000.15x = 650,027,618.02
  5. Step 5: Solve for x
    x = 650,027,618.02/21,000.15
  6. Step 6: Final answer
    x = 30,953.48

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Double scale
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Similar ratio
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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.