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Finding the Fourth Proportional to 8,720.16, 12,032.10 and 4,891.92

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Solution

The fourth proportional to 8,720.16, 12,032.10 and 4,891.92 is: 6,749.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.16 : 12,032.10 = 4,891.92 : x
  2. Step 2: Convert to fraction form
    8,720.16/12,032.10 = 4,891.92/x
  3. Step 3: Cross multiply
    8,720.16x = 12,032.10 × 4,891.92
  4. Step 4: Simplify right side
    8,720.16x = 58,860,070.63
  5. Step 5: Solve for x
    x = 58,860,070.63/8,720.16
  6. Step 6: Final answer
    x = 6,749.88

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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.