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Finding the Fourth Proportional to 921.33, 1,271.02 and 548.11

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Solution

The fourth proportional to 921.33, 1,271.02 and 548.11 is: 756.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.33 : 1,271.02 = 548.11 : x
  2. Step 2: Convert to fraction form
    921.33/1,271.02 = 548.11/x
  3. Step 3: Cross multiply
    921.33x = 1,271.02 × 548.11
  4. Step 4: Simplify right side
    921.33x = 696,658.77
  5. Step 5: Solve for x
    x = 696,658.77/921.33
  6. Step 6: Final answer
    x = 756.14

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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.