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Finding the Fourth Proportional to 21,270, 31,905 and 5,687.28

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Solution

The fourth proportional to 21,270, 31,905 and 5,687.28 is: 8,530.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270 : 31,905 = 5,687.28 : x
  2. Step 2: Convert to fraction form
    21,270/31,905 = 5,687.28/x
  3. Step 3: Cross multiply
    21,270x = 31,905 × 5,687.28
  4. Step 4: Simplify right side
    21,270x = 181,452,668.40
  5. Step 5: Solve for x
    x = 181,452,668.40/21,270
  6. Step 6: Final answer
    x = 8,530.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.