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Finding the Fourth Proportional to 961.61, 1,327.79 and 666.36

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Solution

The fourth proportional to 961.61, 1,327.79 and 666.36 is: 920.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.61 : 1,327.79 = 666.36 : x
  2. Step 2: Convert to fraction form
    961.61/1,327.79 = 666.36/x
  3. Step 3: Cross multiply
    961.61x = 1,327.79 × 666.36
  4. Step 4: Simplify right side
    961.61x = 884,787.81
  5. Step 5: Solve for x
    x = 884,787.81/961.61
  6. Step 6: Final answer
    x = 920.12

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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.