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Finding the Fourth Proportional to 35.74, 53.60 and 20.47

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Solution

The fourth proportional to 35.74, 53.60 and 20.47 is: 30.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.74 : 53.60 = 20.47 : x
  2. Step 2: Convert to fraction form
    35.74/53.60 = 20.47/x
  3. Step 3: Cross multiply
    35.74x = 53.60 × 20.47
  4. Step 4: Simplify right side
    35.74x = 1,097.19
  5. Step 5: Solve for x
    x = 1,097.19/35.74
  6. Step 6: Final answer
    x = 30.70

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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.