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Finding the Fourth Proportional to 123.02, 169.64 and 79.32

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Solution

The fourth proportional to 123.02, 169.64 and 79.32 is: 109.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.02 : 169.64 = 79.32 : x
  2. Step 2: Convert to fraction form
    123.02/169.64 = 79.32/x
  3. Step 3: Cross multiply
    123.02x = 169.64 × 79.32
  4. Step 4: Simplify right side
    123.02x = 13,455.84
  5. Step 5: Solve for x
    x = 13,455.84/123.02
  6. Step 6: Final answer
    x = 109.38

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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.