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Finding the Fourth Proportional to 15.65, 23.30 and 15

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Solution

The fourth proportional to 15.65, 23.30 and 15 is: 22.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.65 : 23.30 = 15 : x
  2. Step 2: Convert to fraction form
    15.65/23.30 = 15/x
  3. Step 3: Cross multiply
    15.65x = 23.30 × 15
  4. Step 4: Simplify right side
    15.65x = 349.43
  5. Step 5: Solve for x
    x = 349.43/15.65
  6. Step 6: Final answer
    x = 22.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.