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Finding the Fourth Proportional to 284.58, 392.76 and 210.78

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Solution

The fourth proportional to 284.58, 392.76 and 210.78 is: 290.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.58 : 392.76 = 210.78 : x
  2. Step 2: Convert to fraction form
    284.58/392.76 = 210.78/x
  3. Step 3: Cross multiply
    284.58x = 392.76 × 210.78
  4. Step 4: Simplify right side
    284.58x = 82,785.95
  5. Step 5: Solve for x
    x = 82,785.95/284.58
  6. Step 6: Final answer
    x = 290.91

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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.