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Finding the Fourth Proportional to 913.68, 1,370.35 and 451.30

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Solution

The fourth proportional to 913.68, 1,370.35 and 451.30 is: 676.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.68 : 1,370.35 = 451.30 : x
  2. Step 2: Convert to fraction form
    913.68/1,370.35 = 451.30/x
  3. Step 3: Cross multiply
    913.68x = 1,370.35 × 451.30
  4. Step 4: Simplify right side
    913.68x = 618,438.96
  5. Step 5: Solve for x
    x = 618,438.96/913.68
  6. Step 6: Final answer
    x = 676.87

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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.