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Finding the Fourth Proportional to 611.17, 916.43 and 215.66

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Solution

The fourth proportional to 611.17, 916.43 and 215.66 is: 323.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.17 : 916.43 = 215.66 : x
  2. Step 2: Convert to fraction form
    611.17/916.43 = 215.66/x
  3. Step 3: Cross multiply
    611.17x = 916.43 × 215.66
  4. Step 4: Simplify right side
    611.17x = 197,638.51
  5. Step 5: Solve for x
    x = 197,638.51/611.17
  6. Step 6: Final answer
    x = 323.38

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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.