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Finding the Fourth Proportional to 921.35, 1,271.39 and 522.99

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Solution

The fourth proportional to 921.35, 1,271.39 and 522.99 is: 721.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.35 : 1,271.39 = 522.99 : x
  2. Step 2: Convert to fraction form
    921.35/1,271.39 = 522.99/x
  3. Step 3: Cross multiply
    921.35x = 1,271.39 × 522.99
  4. Step 4: Simplify right side
    921.35x = 664,921.64
  5. Step 5: Solve for x
    x = 664,921.64/921.35
  6. Step 6: Final answer
    x = 721.68

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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.