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Finding the Fourth Proportional to 610.64, 915.72 and 220.56

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Solution

The fourth proportional to 610.64, 915.72 and 220.56 is: 330.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.64 : 915.72 = 220.56 : x
  2. Step 2: Convert to fraction form
    610.64/915.72 = 220.56/x
  3. Step 3: Cross multiply
    610.64x = 915.72 × 220.56
  4. Step 4: Simplify right side
    610.64x = 201,971.20
  5. Step 5: Solve for x
    x = 201,971.20/610.64
  6. Step 6: Final answer
    x = 330.75

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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.