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Finding the Fourth Proportional to 913.61, 1,370.51 and 451.13

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Solution

The fourth proportional to 913.61, 1,370.51 and 451.13 is: 676.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.61 : 1,370.51 = 451.13 : x
  2. Step 2: Convert to fraction form
    913.61/1,370.51 = 451.13/x
  3. Step 3: Cross multiply
    913.61x = 1,370.51 × 451.13
  4. Step 4: Simplify right side
    913.61x = 618,280.13
  5. Step 5: Solve for x
    x = 618,280.13/913.61
  6. Step 6: Final answer
    x = 676.75

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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.