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Finding the Fourth Proportional to 285.64, 425.85 and 278.42

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Solution

The fourth proportional to 285.64, 425.85 and 278.42 is: 415.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.64 : 425.85 = 278.42 : x
  2. Step 2: Convert to fraction form
    285.64/425.85 = 278.42/x
  3. Step 3: Cross multiply
    285.64x = 425.85 × 278.42
  4. Step 4: Simplify right side
    285.64x = 118,565.16
  5. Step 5: Solve for x
    x = 118,565.16/285.64
  6. Step 6: Final answer
    x = 415.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.