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Finding the Fourth Proportional to 934.99, 1,290.30 and 515.36

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Solution

The fourth proportional to 934.99, 1,290.30 and 515.36 is: 711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.99 : 1,290.30 = 515.36 : x
  2. Step 2: Convert to fraction form
    934.99/1,290.30 = 515.36/x
  3. Step 3: Cross multiply
    934.99x = 1,290.30 × 515.36
  4. Step 4: Simplify right side
    934.99x = 664,971.57
  5. Step 5: Solve for x
    x = 664,971.57/934.99
  6. Step 6: Final answer
    x = 711.20

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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.