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Finding the Fourth Proportional to 864.20, 1,300.96 and 787.66

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Solution

The fourth proportional to 864.20, 1,300.96 and 787.66 is: 1,185.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.20 : 1,300.96 = 787.66 : x
  2. Step 2: Convert to fraction form
    864.20/1,300.96 = 787.66/x
  3. Step 3: Cross multiply
    864.20x = 1,300.96 × 787.66
  4. Step 4: Simplify right side
    864.20x = 1,024,714.15
  5. Step 5: Solve for x
    x = 1,024,714.15/864.20
  6. Step 6: Final answer
    x = 1,185.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.