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Finding the Fourth Proportional to 55.19, 76.16 and 30.63

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Solution

The fourth proportional to 55.19, 76.16 and 30.63 is: 42.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.19 : 76.16 = 30.63 : x
  2. Step 2: Convert to fraction form
    55.19/76.16 = 30.63/x
  3. Step 3: Cross multiply
    55.19x = 76.16 × 30.63
  4. Step 4: Simplify right side
    55.19x = 2,333.04
  5. Step 5: Solve for x
    x = 2,333.04/55.19
  6. Step 6: Final answer
    x = 42.28

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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.