Home / 21,287.40-31,905.18-18,647.88

Finding the Fourth Proportional to 21,287.40, 31,905.18 and 18,647.88

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Solution

The fourth proportional to 21,287.40, 31,905.18 and 18,647.88 is: 27,949.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287.40 : 31,905.18 = 18,647.88 : x
  2. Step 2: Convert to fraction form
    21,287.40/31,905.18 = 18,647.88/x
  3. Step 3: Cross multiply
    21,287.40x = 31,905.18 × 18,647.88
  4. Step 4: Simplify right side
    21,287.40x = 594,963,968.02
  5. Step 5: Solve for x
    x = 594,963,968.02/21,287.40
  6. Step 6: Final answer
    x = 27,949.11

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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.