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Finding the Fourth Proportional to 611.07, 916.20 and 317.85

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Solution

The fourth proportional to 611.07, 916.20 and 317.85 is: 476.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.07 : 916.20 = 317.85 : x
  2. Step 2: Convert to fraction form
    611.07/916.20 = 317.85/x
  3. Step 3: Cross multiply
    611.07x = 916.20 × 317.85
  4. Step 4: Simplify right side
    611.07x = 291,214.17
  5. Step 5: Solve for x
    x = 291,214.17/611.07
  6. Step 6: Final answer
    x = 476.56

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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.