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Finding the Fourth Proportional to 485.91, 728.86 and 197.35

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Solution

The fourth proportional to 485.91, 728.86 and 197.35 is: 296.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.91 : 728.86 = 197.35 : x
  2. Step 2: Convert to fraction form
    485.91/728.86 = 197.35/x
  3. Step 3: Cross multiply
    485.91x = 728.86 × 197.35
  4. Step 4: Simplify right side
    485.91x = 143,838.21
  5. Step 5: Solve for x
    x = 143,838.21/485.91
  6. Step 6: Final answer
    x = 296.02

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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.