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Finding the Fourth Proportional to 918.06, 1,265.72 and 665.76

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Solution

The fourth proportional to 918.06, 1,265.72 and 665.76 is: 917.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.06 : 1,265.72 = 665.76 : x
  2. Step 2: Convert to fraction form
    918.06/1,265.72 = 665.76/x
  3. Step 3: Cross multiply
    918.06x = 1,265.72 × 665.76
  4. Step 4: Simplify right side
    918.06x = 842,665.75
  5. Step 5: Solve for x
    x = 842,665.75/918.06
  6. Step 6: Final answer
    x = 917.88

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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.