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Finding the Fourth Proportional to 929.86, 1,393.88 and 344.72

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Solution

The fourth proportional to 929.86, 1,393.88 and 344.72 is: 516.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.86 : 1,393.88 = 344.72 : x
  2. Step 2: Convert to fraction form
    929.86/1,393.88 = 344.72/x
  3. Step 3: Cross multiply
    929.86x = 1,393.88 × 344.72
  4. Step 4: Simplify right side
    929.86x = 480,498.31
  5. Step 5: Solve for x
    x = 480,498.31/929.86
  6. Step 6: Final answer
    x = 516.74

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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.