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Finding the Fourth Proportional to 953.71, 1,322.85 and 928.42

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Solution

The fourth proportional to 953.71, 1,322.85 and 928.42 is: 1,287.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.71 : 1,322.85 = 928.42 : x
  2. Step 2: Convert to fraction form
    953.71/1,322.85 = 928.42/x
  3. Step 3: Cross multiply
    953.71x = 1,322.85 × 928.42
  4. Step 4: Simplify right side
    953.71x = 1,228,149.14
  5. Step 5: Solve for x
    x = 1,228,149.14/953.71
  6. Step 6: Final answer
    x = 1,287.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.