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Finding the Fourth Proportional to 908.83, 1,256.18 and 661.88

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Solution

The fourth proportional to 908.83, 1,256.18 and 661.88 is: 914.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.83 : 1,256.18 = 661.88 : x
  2. Step 2: Convert to fraction form
    908.83/1,256.18 = 661.88/x
  3. Step 3: Cross multiply
    908.83x = 1,256.18 × 661.88
  4. Step 4: Simplify right side
    908.83x = 831,442.30
  5. Step 5: Solve for x
    x = 831,442.30/908.83
  6. Step 6: Final answer
    x = 914.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.