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Finding the Fourth Proportional to 1,242.69, 1,712.39 and 961.22

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Solution

The fourth proportional to 1,242.69, 1,712.39 and 961.22 is: 1,324.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.69 : 1,712.39 = 961.22 : x
  2. Step 2: Convert to fraction form
    1,242.69/1,712.39 = 961.22/x
  3. Step 3: Cross multiply
    1,242.69x = 1,712.39 × 961.22
  4. Step 4: Simplify right side
    1,242.69x = 1,645,970.15
  5. Step 5: Solve for x
    x = 1,645,970.15/1,242.69
  6. Step 6: Final answer
    x = 1,324.52

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1.5x scale

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.