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Finding the Fourth Proportional to 8,765.64, 13,140.27 and 2,920.89

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Solution

The fourth proportional to 8,765.64, 13,140.27 and 2,920.89 is: 4,378.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.64 : 13,140.27 = 2,920.89 : x
  2. Step 2: Convert to fraction form
    8,765.64/13,140.27 = 2,920.89/x
  3. Step 3: Cross multiply
    8,765.64x = 13,140.27 × 2,920.89
  4. Step 4: Simplify right side
    8,765.64x = 38,381,283.24
  5. Step 5: Solve for x
    x = 38,381,283.24/8,765.64
  6. Step 6: Final answer
    x = 4,378.61

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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.