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Finding the Fourth Proportional to 991.95, 1,486.71 and 558.20

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Solution

The fourth proportional to 991.95, 1,486.71 and 558.20 is: 836.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.95 : 1,486.71 = 558.20 : x
  2. Step 2: Convert to fraction form
    991.95/1,486.71 = 558.20/x
  3. Step 3: Cross multiply
    991.95x = 1,486.71 × 558.20
  4. Step 4: Simplify right side
    991.95x = 829,874.09
  5. Step 5: Solve for x
    x = 829,874.09/991.95
  6. Step 6: Final answer
    x = 836.61

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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.