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Finding the Fourth Proportional to 913.81, 1,260.55 and 634.21

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Solution

The fourth proportional to 913.81, 1,260.55 and 634.21 is: 874.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.81 : 1,260.55 = 634.21 : x
  2. Step 2: Convert to fraction form
    913.81/1,260.55 = 634.21/x
  3. Step 3: Cross multiply
    913.81x = 1,260.55 × 634.21
  4. Step 4: Simplify right side
    913.81x = 799,453.42
  5. Step 5: Solve for x
    x = 799,453.42/913.81
  6. Step 6: Final answer
    x = 874.86

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1.5x scale

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.