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Finding the Fourth Proportional to 959.40, 1,323.48 and 644.25

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Solution

The fourth proportional to 959.40, 1,323.48 and 644.25 is: 888.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.40 : 1,323.48 = 644.25 : x
  2. Step 2: Convert to fraction form
    959.40/1,323.48 = 644.25/x
  3. Step 3: Cross multiply
    959.40x = 1,323.48 × 644.25
  4. Step 4: Simplify right side
    959.40x = 852,651.99
  5. Step 5: Solve for x
    x = 852,651.99/959.40
  6. Step 6: Final answer
    x = 888.73

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1.5x scale

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.