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Finding the Fourth Proportional to 2,160.64, 3,240.17 and 773.60

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Solution

The fourth proportional to 2,160.64, 3,240.17 and 773.60 is: 1,160.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.64 : 3,240.17 = 773.60 : x
  2. Step 2: Convert to fraction form
    2,160.64/3,240.17 = 773.60/x
  3. Step 3: Cross multiply
    2,160.64x = 3,240.17 × 773.60
  4. Step 4: Simplify right side
    2,160.64x = 2,506,599.74
  5. Step 5: Solve for x
    x = 2,506,599.74/2,160.64
  6. Step 6: Final answer
    x = 1,160.12

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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.