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Finding the Fourth Proportional to 959.63, 1,440 and 404.28

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Solution

The fourth proportional to 959.63, 1,440 and 404.28 is: 606.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.63 : 1,440 = 404.28 : x
  2. Step 2: Convert to fraction form
    959.63/1,440 = 404.28/x
  3. Step 3: Cross multiply
    959.63x = 1,440 × 404.28
  4. Step 4: Simplify right side
    959.63x = 582,163.20
  5. Step 5: Solve for x
    x = 582,163.20/959.63
  6. Step 6: Final answer
    x = 606.66

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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.