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Finding the Fourth Proportional to 917.92, 1,266.31 and 638.82

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Solution

The fourth proportional to 917.92, 1,266.31 and 638.82 is: 881.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,266.31 = 638.82 : x
  2. Step 2: Convert to fraction form
    917.92/1,266.31 = 638.82/x
  3. Step 3: Cross multiply
    917.92x = 1,266.31 × 638.82
  4. Step 4: Simplify right side
    917.92x = 808,944.15
  5. Step 5: Solve for x
    x = 808,944.15/917.92
  6. Step 6: Final answer
    x = 881.28

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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.