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Finding the Fourth Proportional to 991.02, 1,486.98 and 861.15

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Solution

The fourth proportional to 991.02, 1,486.98 and 861.15 is: 1,292.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.02 : 1,486.98 = 861.15 : x
  2. Step 2: Convert to fraction form
    991.02/1,486.98 = 861.15/x
  3. Step 3: Cross multiply
    991.02x = 1,486.98 × 861.15
  4. Step 4: Simplify right side
    991.02x = 1,280,512.83
  5. Step 5: Solve for x
    x = 1,280,512.83/991.02
  6. Step 6: Final answer
    x = 1,292.12

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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.