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Finding the Fourth Proportional to 284.58, 392.58 and 201.78

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Solution

The fourth proportional to 284.58, 392.58 and 201.78 is: 278.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.58 : 392.58 = 201.78 : x
  2. Step 2: Convert to fraction form
    284.58/392.58 = 201.78/x
  3. Step 3: Cross multiply
    284.58x = 392.58 × 201.78
  4. Step 4: Simplify right side
    284.58x = 79,214.79
  5. Step 5: Solve for x
    x = 79,214.79/284.58
  6. Step 6: Final answer
    x = 278.36

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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.