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Finding the Fourth Proportional to 767.32, 1,153.41 and 660.40

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Solution

The fourth proportional to 767.32, 1,153.41 and 660.40 is: 992.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.32 : 1,153.41 = 660.40 : x
  2. Step 2: Convert to fraction form
    767.32/1,153.41 = 660.40/x
  3. Step 3: Cross multiply
    767.32x = 1,153.41 × 660.40
  4. Step 4: Simplify right side
    767.32x = 761,711.96
  5. Step 5: Solve for x
    x = 761,711.96/767.32
  6. Step 6: Final answer
    x = 992.69

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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.