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Finding the Fourth Proportional to 30.80, 42.45 and 23.51

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Solution

The fourth proportional to 30.80, 42.45 and 23.51 is: 32.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.80 : 42.45 = 23.51 : x
  2. Step 2: Convert to fraction form
    30.80/42.45 = 23.51/x
  3. Step 3: Cross multiply
    30.80x = 42.45 × 23.51
  4. Step 4: Simplify right side
    30.80x = 998.00
  5. Step 5: Solve for x
    x = 998.00/30.80
  6. Step 6: Final answer
    x = 32.40

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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.