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Finding the Fourth Proportional to 955.70, 1,434.19 and 339.40

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Solution

The fourth proportional to 955.70, 1,434.19 and 339.40 is: 509.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.70 : 1,434.19 = 339.40 : x
  2. Step 2: Convert to fraction form
    955.70/1,434.19 = 339.40/x
  3. Step 3: Cross multiply
    955.70x = 1,434.19 × 339.40
  4. Step 4: Simplify right side
    955.70x = 486,764.09
  5. Step 5: Solve for x
    x = 486,764.09/955.70
  6. Step 6: Final answer
    x = 509.33

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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.