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Finding the Fourth Proportional to 164.78, 247.08 and 87.77

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Solution

The fourth proportional to 164.78, 247.08 and 87.77 is: 131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.78 : 247.08 = 87.77 : x
  2. Step 2: Convert to fraction form
    164.78/247.08 = 87.77/x
  3. Step 3: Cross multiply
    164.78x = 247.08 × 87.77
  4. Step 4: Simplify right side
    164.78x = 21,684.98
  5. Step 5: Solve for x
    x = 21,684.98/164.78
  6. Step 6: Final answer
    x = 131.60

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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.