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Finding the Fourth Proportional to 959.60, 1,439.41 and 266.26

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Solution

The fourth proportional to 959.60, 1,439.41 and 266.26 is: 399.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.60 : 1,439.41 = 266.26 : x
  2. Step 2: Convert to fraction form
    959.60/1,439.41 = 266.26/x
  3. Step 3: Cross multiply
    959.60x = 1,439.41 × 266.26
  4. Step 4: Simplify right side
    959.60x = 383,260.24
  5. Step 5: Solve for x
    x = 383,260.24/959.60
  6. Step 6: Final answer
    x = 399.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.