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Finding the Fourth Proportional to 921.47, 1,271.62 and 548.45

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Solution

The fourth proportional to 921.47, 1,271.62 and 548.45 is: 756.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.47 : 1,271.62 = 548.45 : x
  2. Step 2: Convert to fraction form
    921.47/1,271.62 = 548.45/x
  3. Step 3: Cross multiply
    921.47x = 1,271.62 × 548.45
  4. Step 4: Simplify right side
    921.47x = 697,410.89
  5. Step 5: Solve for x
    x = 697,410.89/921.47
  6. Step 6: Final answer
    x = 756.85

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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.