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Finding the Fourth Proportional to 485.91, 728.95 and 193.42

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Solution

The fourth proportional to 485.91, 728.95 and 193.42 is: 290.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.91 : 728.95 = 193.42 : x
  2. Step 2: Convert to fraction form
    485.91/728.95 = 193.42/x
  3. Step 3: Cross multiply
    485.91x = 728.95 × 193.42
  4. Step 4: Simplify right side
    485.91x = 140,992.17
  5. Step 5: Solve for x
    x = 140,992.17/485.91
  6. Step 6: Final answer
    x = 290.16

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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.