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Finding the Fourth Proportional to 285.02, 392.91 and 201.87

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Solution

The fourth proportional to 285.02, 392.91 and 201.87 is: 278.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.02 : 392.91 = 201.87 : x
  2. Step 2: Convert to fraction form
    285.02/392.91 = 201.87/x
  3. Step 3: Cross multiply
    285.02x = 392.91 × 201.87
  4. Step 4: Simplify right side
    285.02x = 79,316.74
  5. Step 5: Solve for x
    x = 79,316.74/285.02
  6. Step 6: Final answer
    x = 278.28

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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.