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Finding the Fourth Proportional to 921.08, 1,381.35 and 758.36

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Solution

The fourth proportional to 921.08, 1,381.35 and 758.36 is: 1,137.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.08 : 1,381.35 = 758.36 : x
  2. Step 2: Convert to fraction form
    921.08/1,381.35 = 758.36/x
  3. Step 3: Cross multiply
    921.08x = 1,381.35 × 758.36
  4. Step 4: Simplify right side
    921.08x = 1,047,560.59
  5. Step 5: Solve for x
    x = 1,047,560.59/921.08
  6. Step 6: Final answer
    x = 1,137.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.