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Finding the Fourth Proportional to 611.86, 915.56 and 406.12

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Solution

The fourth proportional to 611.86, 915.56 and 406.12 is: 607.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.86 : 915.56 = 406.12 : x
  2. Step 2: Convert to fraction form
    611.86/915.56 = 406.12/x
  3. Step 3: Cross multiply
    611.86x = 915.56 × 406.12
  4. Step 4: Simplify right side
    611.86x = 371,827.23
  5. Step 5: Solve for x
    x = 371,827.23/611.86
  6. Step 6: Final answer
    x = 607.70

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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.