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Finding the Fourth Proportional to 85.30, 127.86 and 39.03

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Solution

The fourth proportional to 85.30, 127.86 and 39.03 is: 58.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.30 : 127.86 = 39.03 : x
  2. Step 2: Convert to fraction form
    85.30/127.86 = 39.03/x
  3. Step 3: Cross multiply
    85.30x = 127.86 × 39.03
  4. Step 4: Simplify right side
    85.30x = 4,990.38
  5. Step 5: Solve for x
    x = 4,990.38/85.30
  6. Step 6: Final answer
    x = 58.50

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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.