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Finding the Fourth Proportional to 285.16, 428.14 and 148.30

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Solution

The fourth proportional to 285.16, 428.14 and 148.30 is: 222.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.16 : 428.14 = 148.30 : x
  2. Step 2: Convert to fraction form
    285.16/428.14 = 148.30/x
  3. Step 3: Cross multiply
    285.16x = 428.14 × 148.30
  4. Step 4: Simplify right side
    285.16x = 63,493.16
  5. Step 5: Solve for x
    x = 63,493.16/285.16
  6. Step 6: Final answer
    x = 222.66

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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.