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Finding the Fourth Proportional to 285.04, 427.83 and 138.88

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Solution

The fourth proportional to 285.04, 427.83 and 138.88 is: 208.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.04 : 427.83 = 138.88 : x
  2. Step 2: Convert to fraction form
    285.04/427.83 = 138.88/x
  3. Step 3: Cross multiply
    285.04x = 427.83 × 138.88
  4. Step 4: Simplify right side
    285.04x = 59,417.03
  5. Step 5: Solve for x
    x = 59,417.03/285.04
  6. Step 6: Final answer
    x = 208.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.