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Finding the Fourth Proportional to 967.72, 1,332.66 and 921.64

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Solution

The fourth proportional to 967.72, 1,332.66 and 921.64 is: 1,269.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.72 : 1,332.66 = 921.64 : x
  2. Step 2: Convert to fraction form
    967.72/1,332.66 = 921.64/x
  3. Step 3: Cross multiply
    967.72x = 1,332.66 × 921.64
  4. Step 4: Simplify right side
    967.72x = 1,228,232.76
  5. Step 5: Solve for x
    x = 1,228,232.76/967.72
  6. Step 6: Final answer
    x = 1,269.20

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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.