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Finding the Fourth Proportional to 123.32, 170 and 90.56

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Solution

The fourth proportional to 123.32, 170 and 90.56 is: 124.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.32 : 170 = 90.56 : x
  2. Step 2: Convert to fraction form
    123.32/170 = 90.56/x
  3. Step 3: Cross multiply
    123.32x = 170 × 90.56
  4. Step 4: Simplify right side
    123.32x = 15,395.20
  5. Step 5: Solve for x
    x = 15,395.20/123.32
  6. Step 6: Final answer
    x = 124.84

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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.