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Finding the Fourth Proportional to 991.44, 1,484.46 and 921.24

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Solution

The fourth proportional to 991.44, 1,484.46 and 921.24 is: 1,379.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.44 : 1,484.46 = 921.24 : x
  2. Step 2: Convert to fraction form
    991.44/1,484.46 = 921.24/x
  3. Step 3: Cross multiply
    991.44x = 1,484.46 × 921.24
  4. Step 4: Simplify right side
    991.44x = 1,367,543.93
  5. Step 5: Solve for x
    x = 1,367,543.93/991.44
  6. Step 6: Final answer
    x = 1,379.35

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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.