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Finding the Fourth Proportional to 825.32, 1,240.12 and 621.81

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Solution

The fourth proportional to 825.32, 1,240.12 and 621.81 is: 934.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.32 : 1,240.12 = 621.81 : x
  2. Step 2: Convert to fraction form
    825.32/1,240.12 = 621.81/x
  3. Step 3: Cross multiply
    825.32x = 1,240.12 × 621.81
  4. Step 4: Simplify right side
    825.32x = 771,119.02
  5. Step 5: Solve for x
    x = 771,119.02/825.32
  6. Step 6: Final answer
    x = 934.33

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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.