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Finding the Fourth Proportional to 959.71, 1,323.85 and 664.46

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Solution

The fourth proportional to 959.71, 1,323.85 and 664.46 is: 916.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.71 : 1,323.85 = 664.46 : x
  2. Step 2: Convert to fraction form
    959.71/1,323.85 = 664.46/x
  3. Step 3: Cross multiply
    959.71x = 1,323.85 × 664.46
  4. Step 4: Simplify right side
    959.71x = 879,642.05
  5. Step 5: Solve for x
    x = 879,642.05/959.71
  6. Step 6: Final answer
    x = 916.58

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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.