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Finding the Fourth Proportional to 981.11, 1,353.41 and 587.86

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Solution

The fourth proportional to 981.11, 1,353.41 and 587.86 is: 810.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.11 : 1,353.41 = 587.86 : x
  2. Step 2: Convert to fraction form
    981.11/1,353.41 = 587.86/x
  3. Step 3: Cross multiply
    981.11x = 1,353.41 × 587.86
  4. Step 4: Simplify right side
    981.11x = 795,611.48
  5. Step 5: Solve for x
    x = 795,611.48/981.11
  6. Step 6: Final answer
    x = 810.93

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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.