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Finding the Fourth Proportional to 1,029.92, 1,543.20 and 823.40

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Solution

The fourth proportional to 1,029.92, 1,543.20 and 823.40 is: 1,233.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.92 : 1,543.20 = 823.40 : x
  2. Step 2: Convert to fraction form
    1,029.92/1,543.20 = 823.40/x
  3. Step 3: Cross multiply
    1,029.92x = 1,543.20 × 823.40
  4. Step 4: Simplify right side
    1,029.92x = 1,270,670.88
  5. Step 5: Solve for x
    x = 1,270,670.88/1,029.92
  6. Step 6: Final answer
    x = 1,233.76

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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.