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Finding the Fourth Proportional to 35.70, 53.47 and 20.45

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Solution

The fourth proportional to 35.70, 53.47 and 20.45 is: 30.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.70 : 53.47 = 20.45 : x
  2. Step 2: Convert to fraction form
    35.70/53.47 = 20.45/x
  3. Step 3: Cross multiply
    35.70x = 53.47 × 20.45
  4. Step 4: Simplify right side
    35.70x = 1,093.46
  5. Step 5: Solve for x
    x = 1,093.46/35.70
  6. Step 6: Final answer
    x = 30.63

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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.