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Finding the Fourth Proportional to 955.44, 1,317.68 and 640.72

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Solution

The fourth proportional to 955.44, 1,317.68 and 640.72 is: 883.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.44 : 1,317.68 = 640.72 : x
  2. Step 2: Convert to fraction form
    955.44/1,317.68 = 640.72/x
  3. Step 3: Cross multiply
    955.44x = 1,317.68 × 640.72
  4. Step 4: Simplify right side
    955.44x = 844,263.93
  5. Step 5: Solve for x
    x = 844,263.93/955.44
  6. Step 6: Final answer
    x = 883.64

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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.