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Finding the Fourth Proportional to 285.74, 394.05 and 230.45

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Solution

The fourth proportional to 285.74, 394.05 and 230.45 is: 317.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.74 : 394.05 = 230.45 : x
  2. Step 2: Convert to fraction form
    285.74/394.05 = 230.45/x
  3. Step 3: Cross multiply
    285.74x = 394.05 × 230.45
  4. Step 4: Simplify right side
    285.74x = 90,808.82
  5. Step 5: Solve for x
    x = 90,808.82/285.74
  6. Step 6: Final answer
    x = 317.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.