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Finding the Fourth Proportional to 103.58, 155.38 and 78.08

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Solution

The fourth proportional to 103.58, 155.38 and 78.08 is: 117.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.58 : 155.38 = 78.08 : x
  2. Step 2: Convert to fraction form
    103.58/155.38 = 78.08/x
  3. Step 3: Cross multiply
    103.58x = 155.38 × 78.08
  4. Step 4: Simplify right side
    103.58x = 12,132.07
  5. Step 5: Solve for x
    x = 12,132.07/103.58
  6. Step 6: Final answer
    x = 117.13

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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.