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Finding the Fourth Proportional to 991.83, 1,488.26 and 580.96

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Solution

The fourth proportional to 991.83, 1,488.26 and 580.96 is: 871.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.83 : 1,488.26 = 580.96 : x
  2. Step 2: Convert to fraction form
    991.83/1,488.26 = 580.96/x
  3. Step 3: Cross multiply
    991.83x = 1,488.26 × 580.96
  4. Step 4: Simplify right side
    991.83x = 864,619.53
  5. Step 5: Solve for x
    x = 864,619.53/991.83
  6. Step 6: Final answer
    x = 871.74

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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.