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Finding the Fourth Proportional to 959.78, 1,324.71 and 561.62

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Solution

The fourth proportional to 959.78, 1,324.71 and 561.62 is: 775.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.78 : 1,324.71 = 561.62 : x
  2. Step 2: Convert to fraction form
    959.78/1,324.71 = 561.62/x
  3. Step 3: Cross multiply
    959.78x = 1,324.71 × 561.62
  4. Step 4: Simplify right side
    959.78x = 743,986.94
  5. Step 5: Solve for x
    x = 743,986.94/959.78
  6. Step 6: Final answer
    x = 775.17

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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.