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Finding the Fourth Proportional to 611.08, 915.18 and 514.60

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Solution

The fourth proportional to 611.08, 915.18 and 514.60 is: 770.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.08 : 915.18 = 514.60 : x
  2. Step 2: Convert to fraction form
    611.08/915.18 = 514.60/x
  3. Step 3: Cross multiply
    611.08x = 915.18 × 514.60
  4. Step 4: Simplify right side
    611.08x = 470,951.63
  5. Step 5: Solve for x
    x = 470,951.63/611.08
  6. Step 6: Final answer
    x = 770.69

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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.