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Finding the Fourth Proportional to 991.01, 1,474.04 and 987.67

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Solution

The fourth proportional to 991.01, 1,474.04 and 987.67 is: 1,469.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.01 : 1,474.04 = 987.67 : x
  2. Step 2: Convert to fraction form
    991.01/1,474.04 = 987.67/x
  3. Step 3: Cross multiply
    991.01x = 1,474.04 × 987.67
  4. Step 4: Simplify right side
    991.01x = 1,455,865.09
  5. Step 5: Solve for x
    x = 1,455,865.09/991.01
  6. Step 6: Final answer
    x = 1,469.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.