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Finding the Fourth Proportional to 961.57, 1,434.81 and 902.79

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Solution

The fourth proportional to 961.57, 1,434.81 and 902.79 is: 1,347.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.57 : 1,434.81 = 902.79 : x
  2. Step 2: Convert to fraction form
    961.57/1,434.81 = 902.79/x
  3. Step 3: Cross multiply
    961.57x = 1,434.81 × 902.79
  4. Step 4: Simplify right side
    961.57x = 1,295,337.15
  5. Step 5: Solve for x
    x = 1,295,337.15/961.57
  6. Step 6: Final answer
    x = 1,347.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.