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Finding the Fourth Proportional to 611.48, 916.74 and 394.61

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Solution

The fourth proportional to 611.48, 916.74 and 394.61 is: 591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.48 : 916.74 = 394.61 : x
  2. Step 2: Convert to fraction form
    611.48/916.74 = 394.61/x
  3. Step 3: Cross multiply
    611.48x = 916.74 × 394.61
  4. Step 4: Simplify right side
    611.48x = 361,750.19
  5. Step 5: Solve for x
    x = 361,750.19/611.48
  6. Step 6: Final answer
    x = 591.60

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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.