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Finding the Fourth Proportional to 944.90, 1,415.80 and 578.91

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Solution

The fourth proportional to 944.90, 1,415.80 and 578.91 is: 867.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    944.90 : 1,415.80 = 578.91 : x
  2. Step 2: Convert to fraction form
    944.90/1,415.80 = 578.91/x
  3. Step 3: Cross multiply
    944.90x = 1,415.80 × 578.91
  4. Step 4: Simplify right side
    944.90x = 819,620.78
  5. Step 5: Solve for x
    x = 819,620.78/944.90
  6. Step 6: Final answer
    x = 867.42

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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.