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Finding the Fourth Proportional to 15.58, 21.38 and 15.52

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Solution

The fourth proportional to 15.58, 21.38 and 15.52 is: 21.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.58 : 21.38 = 15.52 : x
  2. Step 2: Convert to fraction form
    15.58/21.38 = 15.52/x
  3. Step 3: Cross multiply
    15.58x = 21.38 × 15.52
  4. Step 4: Simplify right side
    15.58x = 331.82
  5. Step 5: Solve for x
    x = 331.82/15.58
  6. Step 6: Final answer
    x = 21.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.