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Finding the Fourth Proportional to 53.61, 73.90 and 42.69

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Solution

The fourth proportional to 53.61, 73.90 and 42.69 is: 58.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.61 : 73.90 = 42.69 : x
  2. Step 2: Convert to fraction form
    53.61/73.90 = 42.69/x
  3. Step 3: Cross multiply
    53.61x = 73.90 × 42.69
  4. Step 4: Simplify right side
    53.61x = 3,154.79
  5. Step 5: Solve for x
    x = 3,154.79/53.61
  6. Step 6: Final answer
    x = 58.85

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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.