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Finding the Fourth Proportional to 961.79, 1,328.06 and 917.48

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Solution

The fourth proportional to 961.79, 1,328.06 and 917.48 is: 1,266.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.79 : 1,328.06 = 917.48 : x
  2. Step 2: Convert to fraction form
    961.79/1,328.06 = 917.48/x
  3. Step 3: Cross multiply
    961.79x = 1,328.06 × 917.48
  4. Step 4: Simplify right side
    961.79x = 1,218,465.86
  5. Step 5: Solve for x
    x = 1,218,465.86/961.79
  6. Step 6: Final answer
    x = 1,266.88

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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.