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Finding the Fourth Proportional to 55.58, 83.36 and 15

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Solution

The fourth proportional to 55.58, 83.36 and 15 is: 22.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.58 : 83.36 = 15 : x
  2. Step 2: Convert to fraction form
    55.58/83.36 = 15/x
  3. Step 3: Cross multiply
    55.58x = 83.36 × 15
  4. Step 4: Simplify right side
    55.58x = 1,250.44
  5. Step 5: Solve for x
    x = 1,250.44/55.58
  6. Step 6: Final answer
    x = 22.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.