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Finding the Fourth Proportional to 991.18, 1,487.40 and 580.51

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Solution

The fourth proportional to 991.18, 1,487.40 and 580.51 is: 871.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.18 : 1,487.40 = 580.51 : x
  2. Step 2: Convert to fraction form
    991.18/1,487.40 = 580.51/x
  3. Step 3: Cross multiply
    991.18x = 1,487.40 × 580.51
  4. Step 4: Simplify right side
    991.18x = 863,450.57
  5. Step 5: Solve for x
    x = 863,450.57/991.18
  6. Step 6: Final answer
    x = 871.13

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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.