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Finding the Fourth Proportional to 611.40, 916.86 and 379.95

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Solution

The fourth proportional to 611.40, 916.86 and 379.95 is: 569.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.40 : 916.86 = 379.95 : x
  2. Step 2: Convert to fraction form
    611.40/916.86 = 379.95/x
  3. Step 3: Cross multiply
    611.40x = 916.86 × 379.95
  4. Step 4: Simplify right side
    611.40x = 348,360.96
  5. Step 5: Solve for x
    x = 348,360.96/611.40
  6. Step 6: Final answer
    x = 569.78

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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.