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Finding the Fourth Proportional to 8,920.75, 12,307.87 and 5,143.44

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Solution

The fourth proportional to 8,920.75, 12,307.87 and 5,143.44 is: 7,096.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.75 : 12,307.87 = 5,143.44 : x
  2. Step 2: Convert to fraction form
    8,920.75/12,307.87 = 5,143.44/x
  3. Step 3: Cross multiply
    8,920.75x = 12,307.87 × 5,143.44
  4. Step 4: Simplify right side
    8,920.75x = 63,304,790.87
  5. Step 5: Solve for x
    x = 63,304,790.87/8,920.75
  6. Step 6: Final answer
    x = 7,096.35

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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.