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Finding the Fourth Proportional to 767.30, 1,153.17 and 638.15

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Solution

The fourth proportional to 767.30, 1,153.17 and 638.15 is: 959.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.30 : 1,153.17 = 638.15 : x
  2. Step 2: Convert to fraction form
    767.30/1,153.17 = 638.15/x
  3. Step 3: Cross multiply
    767.30x = 1,153.17 × 638.15
  4. Step 4: Simplify right side
    767.30x = 735,889.67
  5. Step 5: Solve for x
    x = 735,889.67/767.30
  6. Step 6: Final answer
    x = 959.07

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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.