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Finding the Fourth Proportional to 961.74, 1,434.38 and 823.50

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Solution

The fourth proportional to 961.74, 1,434.38 and 823.50 is: 1,228.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.74 : 1,434.38 = 823.50 : x
  2. Step 2: Convert to fraction form
    961.74/1,434.38 = 823.50/x
  3. Step 3: Cross multiply
    961.74x = 1,434.38 × 823.50
  4. Step 4: Simplify right side
    961.74x = 1,181,207.81
  5. Step 5: Solve for x
    x = 1,181,207.81/961.74
  6. Step 6: Final answer
    x = 1,228.20

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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.