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Finding the Fourth Proportional to 485.10, 727.69 and 291.42

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Solution

The fourth proportional to 485.10, 727.69 and 291.42 is: 437.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.10 : 727.69 = 291.42 : x
  2. Step 2: Convert to fraction form
    485.10/727.69 = 291.42/x
  3. Step 3: Cross multiply
    485.10x = 727.69 × 291.42
  4. Step 4: Simplify right side
    485.10x = 212,063.42
  5. Step 5: Solve for x
    x = 212,063.42/485.10
  6. Step 6: Final answer
    x = 437.15

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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.