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Finding the Fourth Proportional to 913.52, 1,260.21 and 878.15

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Solution

The fourth proportional to 913.52, 1,260.21 and 878.15 is: 1,211.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.52 : 1,260.21 = 878.15 : x
  2. Step 2: Convert to fraction form
    913.52/1,260.21 = 878.15/x
  3. Step 3: Cross multiply
    913.52x = 1,260.21 × 878.15
  4. Step 4: Simplify right side
    913.52x = 1,106,653.41
  5. Step 5: Solve for x
    x = 1,106,653.41/913.52
  6. Step 6: Final answer
    x = 1,211.42

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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.