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Finding the Fourth Proportional to 955.91, 1,434.53 and 339.61

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Solution

The fourth proportional to 955.91, 1,434.53 and 339.61 is: 509.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.91 : 1,434.53 = 339.61 : x
  2. Step 2: Convert to fraction form
    955.91/1,434.53 = 339.61/x
  3. Step 3: Cross multiply
    955.91x = 1,434.53 × 339.61
  4. Step 4: Simplify right side
    955.91x = 487,178.00
  5. Step 5: Solve for x
    x = 487,178.00/955.91
  6. Step 6: Final answer
    x = 509.65

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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.