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Finding the Fourth Proportional to 959.51, 1,323.63 and 644.85

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Solution

The fourth proportional to 959.51, 1,323.63 and 644.85 is: 889.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.51 : 1,323.63 = 644.85 : x
  2. Step 2: Convert to fraction form
    959.51/1,323.63 = 644.85/x
  3. Step 3: Cross multiply
    959.51x = 1,323.63 × 644.85
  4. Step 4: Simplify right side
    959.51x = 853,542.81
  5. Step 5: Solve for x
    x = 853,542.81/959.51
  6. Step 6: Final answer
    x = 889.56

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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.