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Finding the Fourth Proportional to 840.32, 1,261.20 and 516.32

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Solution

The fourth proportional to 840.32, 1,261.20 and 516.32 is: 774.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.32 : 1,261.20 = 516.32 : x
  2. Step 2: Convert to fraction form
    840.32/1,261.20 = 516.32/x
  3. Step 3: Cross multiply
    840.32x = 1,261.20 × 516.32
  4. Step 4: Simplify right side
    840.32x = 651,182.78
  5. Step 5: Solve for x
    x = 651,182.78/840.32
  6. Step 6: Final answer
    x = 774.92

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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.