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Finding the Fourth Proportional to 913.78, 1,260.71 and 559.58

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Solution

The fourth proportional to 913.78, 1,260.71 and 559.58 is: 772.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.78 : 1,260.71 = 559.58 : x
  2. Step 2: Convert to fraction form
    913.78/1,260.71 = 559.58/x
  3. Step 3: Cross multiply
    913.78x = 1,260.71 × 559.58
  4. Step 4: Simplify right side
    913.78x = 705,464.25
  5. Step 5: Solve for x
    x = 705,464.25/913.78
  6. Step 6: Final answer
    x = 772.03

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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.