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Finding the Fourth Proportional to 934.90, 1,290.20 and 515.28

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Solution

The fourth proportional to 934.90, 1,290.20 and 515.28 is: 711.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.90 : 1,290.20 = 515.28 : x
  2. Step 2: Convert to fraction form
    934.90/1,290.20 = 515.28/x
  3. Step 3: Cross multiply
    934.90x = 1,290.20 × 515.28
  4. Step 4: Simplify right side
    934.90x = 664,814.26
  5. Step 5: Solve for x
    x = 664,814.26/934.90
  6. Step 6: Final answer
    x = 711.11

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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.