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Finding the Fourth Proportional to 611.30, 916.88 and 172.53

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Solution

The fourth proportional to 611.30, 916.88 and 172.53 is: 258.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.30 : 916.88 = 172.53 : x
  2. Step 2: Convert to fraction form
    611.30/916.88 = 172.53/x
  3. Step 3: Cross multiply
    611.30x = 916.88 × 172.53
  4. Step 4: Simplify right side
    611.30x = 158,188.44
  5. Step 5: Solve for x
    x = 158,188.44/611.30
  6. Step 6: Final answer
    x = 258.78

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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.