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Finding the Fourth Proportional to 284.74, 392.74 and 275.21

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Solution

The fourth proportional to 284.74, 392.74 and 275.21 is: 379.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.74 : 392.74 = 275.21 : x
  2. Step 2: Convert to fraction form
    284.74/392.74 = 275.21/x
  3. Step 3: Cross multiply
    284.74x = 392.74 × 275.21
  4. Step 4: Simplify right side
    284.74x = 108,088.55
  5. Step 5: Solve for x
    x = 108,088.55/284.74
  6. Step 6: Final answer
    x = 379.61

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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.