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Finding the Fourth Proportional to 15,532.67, 21,435.93 and 8,819.20

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Solution

The fourth proportional to 15,532.67, 21,435.93 and 8,819.20 is: 12,170.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,532.67 : 21,435.93 = 8,819.20 : x
  2. Step 2: Convert to fraction form
    15,532.67/21,435.93 = 8,819.20/x
  3. Step 3: Cross multiply
    15,532.67x = 21,435.93 × 8,819.20
  4. Step 4: Simplify right side
    15,532.67x = 189,047,753.86
  5. Step 5: Solve for x
    x = 189,047,753.86/15,532.67
  6. Step 6: Final answer
    x = 12,170.98

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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.