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Finding the Fourth Proportional to 958.93, 1,323.33 and 643.70

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Solution

The fourth proportional to 958.93, 1,323.33 and 643.70 is: 888.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.93 : 1,323.33 = 643.70 : x
  2. Step 2: Convert to fraction form
    958.93/1,323.33 = 643.70/x
  3. Step 3: Cross multiply
    958.93x = 1,323.33 × 643.70
  4. Step 4: Simplify right side
    958.93x = 851,827.52
  5. Step 5: Solve for x
    x = 851,827.52/958.93
  6. Step 6: Final answer
    x = 888.31

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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.