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Finding the Fourth Proportional to 837.64, 1,155.71 and 660.05

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Solution

The fourth proportional to 837.64, 1,155.71 and 660.05 is: 910.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.64 : 1,155.71 = 660.05 : x
  2. Step 2: Convert to fraction form
    837.64/1,155.71 = 660.05/x
  3. Step 3: Cross multiply
    837.64x = 1,155.71 × 660.05
  4. Step 4: Simplify right side
    837.64x = 762,829.61
  5. Step 5: Solve for x
    x = 762,829.61/837.64
  6. Step 6: Final answer
    x = 910.69

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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.