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Finding the Fourth Proportional to 21.07, 31.44 and 19.00

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Solution

The fourth proportional to 21.07, 31.44 and 19.00 is: 28.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.07 : 31.44 = 19.00 : x
  2. Step 2: Convert to fraction form
    21.07/31.44 = 19.00/x
  3. Step 3: Cross multiply
    21.07x = 31.44 × 19.00
  4. Step 4: Simplify right side
    21.07x = 597.47
  5. Step 5: Solve for x
    x = 597.47/21.07
  6. Step 6: Final answer
    x = 28.35

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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.