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Finding the Fourth Proportional to 908.40, 1,253.65 and 515.43

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Solution

The fourth proportional to 908.40, 1,253.65 and 515.43 is: 711.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.40 : 1,253.65 = 515.43 : x
  2. Step 2: Convert to fraction form
    908.40/1,253.65 = 515.43/x
  3. Step 3: Cross multiply
    908.40x = 1,253.65 × 515.43
  4. Step 4: Simplify right side
    908.40x = 646,164.66
  5. Step 5: Solve for x
    x = 646,164.66/908.40
  6. Step 6: Final answer
    x = 711.32

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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.