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Finding the Fourth Proportional to 485.83, 729.76 and 393.39

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Solution

The fourth proportional to 485.83, 729.76 and 393.39 is: 590.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.83 : 729.76 = 393.39 : x
  2. Step 2: Convert to fraction form
    485.83/729.76 = 393.39/x
  3. Step 3: Cross multiply
    485.83x = 729.76 × 393.39
  4. Step 4: Simplify right side
    485.83x = 287,080.29
  5. Step 5: Solve for x
    x = 287,080.29/485.83
  6. Step 6: Final answer
    x = 590.91

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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.