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Finding the Fourth Proportional to 53.45, 73.76 and 38.70

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Solution

The fourth proportional to 53.45, 73.76 and 38.70 is: 53.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.45 : 73.76 = 38.70 : x
  2. Step 2: Convert to fraction form
    53.45/73.76 = 38.70/x
  3. Step 3: Cross multiply
    53.45x = 73.76 × 38.70
  4. Step 4: Simplify right side
    53.45x = 2,854.90
  5. Step 5: Solve for x
    x = 2,854.90/53.45
  6. Step 6: Final answer
    x = 53.41

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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.