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Finding the Fourth Proportional to 842.18, 1,261.04 and 611.60

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Solution

The fourth proportional to 842.18, 1,261.04 and 611.60 is: 915.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.18 : 1,261.04 = 611.60 : x
  2. Step 2: Convert to fraction form
    842.18/1,261.04 = 611.60/x
  3. Step 3: Cross multiply
    842.18x = 1,261.04 × 611.60
  4. Step 4: Simplify right side
    842.18x = 771,242.70
  5. Step 5: Solve for x
    x = 771,242.70/842.18
  6. Step 6: Final answer
    x = 915.77

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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.