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Finding the Fourth Proportional to 207.16, 285.90 and 124.30

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Solution

The fourth proportional to 207.16, 285.90 and 124.30 is: 171.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.16 : 285.90 = 124.30 : x
  2. Step 2: Convert to fraction form
    207.16/285.90 = 124.30/x
  3. Step 3: Cross multiply
    207.16x = 285.90 × 124.30
  4. Step 4: Simplify right side
    207.16x = 35,537.37
  5. Step 5: Solve for x
    x = 35,537.37/207.16
  6. Step 6: Final answer
    x = 171.55

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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.