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Finding the Fourth Proportional to 921.30, 1,271.55 and 548.40

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Solution

The fourth proportional to 921.30, 1,271.55 and 548.40 is: 756.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.30 : 1,271.55 = 548.40 : x
  2. Step 2: Convert to fraction form
    921.30/1,271.55 = 548.40/x
  3. Step 3: Cross multiply
    921.30x = 1,271.55 × 548.40
  4. Step 4: Simplify right side
    921.30x = 697,324.84
  5. Step 5: Solve for x
    x = 697,324.84/921.30
  6. Step 6: Final answer
    x = 756.90

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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.