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Finding the Fourth Proportional to 55.40, 76.28 and 47.19

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Solution

The fourth proportional to 55.40, 76.28 and 47.19 is: 64.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.40 : 76.28 = 47.19 : x
  2. Step 2: Convert to fraction form
    55.40/76.28 = 47.19/x
  3. Step 3: Cross multiply
    55.40x = 76.28 × 47.19
  4. Step 4: Simplify right side
    55.40x = 3,599.42
  5. Step 5: Solve for x
    x = 3,599.42/55.40
  6. Step 6: Final answer
    x = 64.98

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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.