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Finding the Fourth Proportional to 961, 1,326.68 and 903.40

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Solution

The fourth proportional to 961, 1,326.68 and 903.40 is: 1,247.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    961 : 1,326.68 = 903.40 : x
  2. Step 2: Convert to fraction form
    961/1,326.68 = 903.40/x
  3. Step 3: Cross multiply
    961x = 1,326.68 × 903.40
  4. Step 4: Simplify right side
    961x = 1,198,522.71
  5. Step 5: Solve for x
    x = 1,198,522.71/961
  6. Step 6: Final answer
    x = 1,247.16

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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.