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Finding the Fourth Proportional to 38.72, 53.50 and 30.00

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Solution

The fourth proportional to 38.72, 53.50 and 30.00 is: 41.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.72 : 53.50 = 30.00 : x
  2. Step 2: Convert to fraction form
    38.72/53.50 = 30.00/x
  3. Step 3: Cross multiply
    38.72x = 53.50 × 30.00
  4. Step 4: Simplify right side
    38.72x = 1,605.13
  5. Step 5: Solve for x
    x = 1,605.13/38.72
  6. Step 6: Final answer
    x = 41.45

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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.