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Finding the Fourth Proportional to 8,791, 12,131 and 4,812.16

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Solution

The fourth proportional to 8,791, 12,131 and 4,812.16 is: 6,640.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,791 : 12,131 = 4,812.16 : x
  2. Step 2: Convert to fraction form
    8,791/12,131 = 4,812.16/x
  3. Step 3: Cross multiply
    8,791x = 12,131 × 4,812.16
  4. Step 4: Simplify right side
    8,791x = 58,376,312.96
  5. Step 5: Solve for x
    x = 58,376,312.96/8,791
  6. Step 6: Final answer
    x = 6,640.46

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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.