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Finding the Fourth Proportional to 920.81, 1,380.27 and 688.07

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Solution

The fourth proportional to 920.81, 1,380.27 and 688.07 is: 1,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.81 : 1,380.27 = 688.07 : x
  2. Step 2: Convert to fraction form
    920.81/1,380.27 = 688.07/x
  3. Step 3: Cross multiply
    920.81x = 1,380.27 × 688.07
  4. Step 4: Simplify right side
    920.81x = 949,722.38
  5. Step 5: Solve for x
    x = 949,722.38/920.81
  6. Step 6: Final answer
    x = 1,031.40

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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.