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Finding the Fourth Proportional to 284.45, 392.72 and 210.67

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Solution

The fourth proportional to 284.45, 392.72 and 210.67 is: 290.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.45 : 392.72 = 210.67 : x
  2. Step 2: Convert to fraction form
    284.45/392.72 = 210.67/x
  3. Step 3: Cross multiply
    284.45x = 392.72 × 210.67
  4. Step 4: Simplify right side
    284.45x = 82,732.29
  5. Step 5: Solve for x
    x = 82,732.29/284.45
  6. Step 6: Final answer
    x = 290.86

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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.