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Finding the Fourth Proportional to 30.01, 41.43 and 21.28

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Solution

The fourth proportional to 30.01, 41.43 and 21.28 is: 29.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.01 : 41.43 = 21.28 : x
  2. Step 2: Convert to fraction form
    30.01/41.43 = 21.28/x
  3. Step 3: Cross multiply
    30.01x = 41.43 × 21.28
  4. Step 4: Simplify right side
    30.01x = 881.63
  5. Step 5: Solve for x
    x = 881.63/30.01
  6. Step 6: Final answer
    x = 29.38

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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.