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Finding the Fourth Proportional to 917.84, 1,266 and 638.12

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Solution

The fourth proportional to 917.84, 1,266 and 638.12 is: 880.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.84 : 1,266 = 638.12 : x
  2. Step 2: Convert to fraction form
    917.84/1,266 = 638.12/x
  3. Step 3: Cross multiply
    917.84x = 1,266 × 638.12
  4. Step 4: Simplify right side
    917.84x = 807,859.92
  5. Step 5: Solve for x
    x = 807,859.92/917.84
  6. Step 6: Final answer
    x = 880.18

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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.