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Finding the Fourth Proportional to 934.70, 1,289.97 and 515.15

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Solution

The fourth proportional to 934.70, 1,289.97 and 515.15 is: 710.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.70 : 1,289.97 = 515.15 : x
  2. Step 2: Convert to fraction form
    934.70/1,289.97 = 515.15/x
  3. Step 3: Cross multiply
    934.70x = 1,289.97 × 515.15
  4. Step 4: Simplify right side
    934.70x = 664,521.60
  5. Step 5: Solve for x
    x = 664,521.60/934.70
  6. Step 6: Final answer
    x = 710.95

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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.