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Finding the Fourth Proportional to 53.79, 74.23 and 30.47

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Solution

The fourth proportional to 53.79, 74.23 and 30.47 is: 42.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.79 : 74.23 = 30.47 : x
  2. Step 2: Convert to fraction form
    53.79/74.23 = 30.47/x
  3. Step 3: Cross multiply
    53.79x = 74.23 × 30.47
  4. Step 4: Simplify right side
    53.79x = 2,261.79
  5. Step 5: Solve for x
    x = 2,261.79/53.79
  6. Step 6: Final answer
    x = 42.05

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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.