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Finding the Fourth Proportional to 55.90, 76.96 and 48.23

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Solution

The fourth proportional to 55.90, 76.96 and 48.23 is: 66.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.90 : 76.96 = 48.23 : x
  2. Step 2: Convert to fraction form
    55.90/76.96 = 48.23/x
  3. Step 3: Cross multiply
    55.90x = 76.96 × 48.23
  4. Step 4: Simplify right side
    55.90x = 3,711.91
  5. Step 5: Solve for x
    x = 3,711.91/55.90
  6. Step 6: Final answer
    x = 66.40

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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.