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Finding the Fourth Proportional to 823.43, 1,235.52 and 608.78

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Solution

The fourth proportional to 823.43, 1,235.52 and 608.78 is: 913.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.43 : 1,235.52 = 608.78 : x
  2. Step 2: Convert to fraction form
    823.43/1,235.52 = 608.78/x
  3. Step 3: Cross multiply
    823.43x = 1,235.52 × 608.78
  4. Step 4: Simplify right side
    823.43x = 752,159.87
  5. Step 5: Solve for x
    x = 752,159.87/823.43
  6. Step 6: Final answer
    x = 913.45

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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.