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Finding the Fourth Proportional to 991.59, 1,487.25 and 580.11

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Solution

The fourth proportional to 991.59, 1,487.25 and 580.11 is: 870.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.59 : 1,487.25 = 580.11 : x
  2. Step 2: Convert to fraction form
    991.59/1,487.25 = 580.11/x
  3. Step 3: Cross multiply
    991.59x = 1,487.25 × 580.11
  4. Step 4: Simplify right side
    991.59x = 862,768.60
  5. Step 5: Solve for x
    x = 862,768.60/991.59
  6. Step 6: Final answer
    x = 870.09

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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.