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Finding the Fourth Proportional to 610.06, 915.20 and 214.78

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Solution

The fourth proportional to 610.06, 915.20 and 214.78 is: 322.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.06 : 915.20 = 214.78 : x
  2. Step 2: Convert to fraction form
    610.06/915.20 = 214.78/x
  3. Step 3: Cross multiply
    610.06x = 915.20 × 214.78
  4. Step 4: Simplify right side
    610.06x = 196,564.37
  5. Step 5: Solve for x
    x = 196,564.37/610.06
  6. Step 6: Final answer
    x = 322.21

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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.