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Finding the Fourth Proportional to 961.94, 1,327.64 and 918.11

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Solution

The fourth proportional to 961.94, 1,327.64 and 918.11 is: 1,267.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.94 : 1,327.64 = 918.11 : x
  2. Step 2: Convert to fraction form
    961.94/1,327.64 = 918.11/x
  3. Step 3: Cross multiply
    961.94x = 1,327.64 × 918.11
  4. Step 4: Simplify right side
    961.94x = 1,218,925.17
  5. Step 5: Solve for x
    x = 1,218,925.17/961.94
  6. Step 6: Final answer
    x = 1,267.16

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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.