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Finding the Fourth Proportional to 123.19, 170 and 74.11

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Solution

The fourth proportional to 123.19, 170 and 74.11 is: 102.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.19 : 170 = 74.11 : x
  2. Step 2: Convert to fraction form
    123.19/170 = 74.11/x
  3. Step 3: Cross multiply
    123.19x = 170 × 74.11
  4. Step 4: Simplify right side
    123.19x = 12,598.70
  5. Step 5: Solve for x
    x = 12,598.70/123.19
  6. Step 6: Final answer
    x = 102.27

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1.5x scale

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.