Home / 20,890.08-31,335.24-5,307.72

Finding the Fourth Proportional to 20,890.08, 31,335.24 and 5,307.72

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Solution

The fourth proportional to 20,890.08, 31,335.24 and 5,307.72 is: 7,961.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.08 : 31,335.24 = 5,307.72 : x
  2. Step 2: Convert to fraction form
    20,890.08/31,335.24 = 5,307.72/x
  3. Step 3: Cross multiply
    20,890.08x = 31,335.24 × 5,307.72
  4. Step 4: Simplify right side
    20,890.08x = 166,318,680.05
  5. Step 5: Solve for x
    x = 166,318,680.05/20,890.08
  6. Step 6: Final answer
    x = 7,961.61

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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.