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Finding the Fourth Proportional to 835.74, 1,151.28 and 639.18

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Solution

The fourth proportional to 835.74, 1,151.28 and 639.18 is: 880.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.74 : 1,151.28 = 639.18 : x
  2. Step 2: Convert to fraction form
    835.74/1,151.28 = 639.18/x
  3. Step 3: Cross multiply
    835.74x = 1,151.28 × 639.18
  4. Step 4: Simplify right side
    835.74x = 735,875.15
  5. Step 5: Solve for x
    x = 735,875.15/835.74
  6. Step 6: Final answer
    x = 880.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.