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Finding the Fourth Proportional to 21, 28.93 and 17.70

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Solution

The fourth proportional to 21, 28.93 and 17.70 is: 24.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21 : 28.93 = 17.70 : x
  2. Step 2: Convert to fraction form
    21/28.93 = 17.70/x
  3. Step 3: Cross multiply
    21x = 28.93 × 17.70
  4. Step 4: Simplify right side
    21x = 512.06
  5. Step 5: Solve for x
    x = 512.06/21
  6. Step 6: Final answer
    x = 24.38

Related Problems

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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.