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Finding the Fourth Proportional to 55.03, 75.86 and 47.63

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Solution

The fourth proportional to 55.03, 75.86 and 47.63 is: 65.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.03 : 75.86 = 47.63 : x
  2. Step 2: Convert to fraction form
    55.03/75.86 = 47.63/x
  3. Step 3: Cross multiply
    55.03x = 75.86 × 47.63
  4. Step 4: Simplify right side
    55.03x = 3,613.21
  5. Step 5: Solve for x
    x = 3,613.21/55.03
  6. Step 6: Final answer
    x = 65.66

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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.