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Finding the Fourth Proportional to 953.88, 1,421.28 and 911.94

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Solution

The fourth proportional to 953.88, 1,421.28 and 911.94 is: 1,358.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.88 : 1,421.28 = 911.94 : x
  2. Step 2: Convert to fraction form
    953.88/1,421.28 = 911.94/x
  3. Step 3: Cross multiply
    953.88x = 1,421.28 × 911.94
  4. Step 4: Simplify right side
    953.88x = 1,296,122.08
  5. Step 5: Solve for x
    x = 1,296,122.08/953.88
  6. Step 6: Final answer
    x = 1,358.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.