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Finding the Fourth Proportional to 611.30, 915.15 and 539.30

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Solution

The fourth proportional to 611.30, 915.15 and 539.30 is: 807.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.30 : 915.15 = 539.30 : x
  2. Step 2: Convert to fraction form
    611.30/915.15 = 539.30/x
  3. Step 3: Cross multiply
    611.30x = 915.15 × 539.30
  4. Step 4: Simplify right side
    611.30x = 493,540.40
  5. Step 5: Solve for x
    x = 493,540.40/611.30
  6. Step 6: Final answer
    x = 807.36

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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.