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Finding the Fourth Proportional to 117.08, 175.40 and 78.50

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Solution

The fourth proportional to 117.08, 175.40 and 78.50 is: 117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.08 : 175.40 = 78.50 : x
  2. Step 2: Convert to fraction form
    117.08/175.40 = 78.50/x
  3. Step 3: Cross multiply
    117.08x = 175.40 × 78.50
  4. Step 4: Simplify right side
    117.08x = 13,768.90
  5. Step 5: Solve for x
    x = 13,768.90/117.08
  6. Step 6: Final answer
    x = 117.60

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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.