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Finding the Fourth Proportional to 285.65, 394.03 and 210.89

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Solution

The fourth proportional to 285.65, 394.03 and 210.89 is: 290.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.65 : 394.03 = 210.89 : x
  2. Step 2: Convert to fraction form
    285.65/394.03 = 210.89/x
  3. Step 3: Cross multiply
    285.65x = 394.03 × 210.89
  4. Step 4: Simplify right side
    285.65x = 83,095.93
  5. Step 5: Solve for x
    x = 83,095.93/285.65
  6. Step 6: Final answer
    x = 290.90

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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.