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Finding the Fourth Proportional to 28,262.44, 42,315.90 and 21,315.88

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Solution

The fourth proportional to 28,262.44, 42,315.90 and 21,315.88 is: 31,915.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,262.44 : 42,315.90 = 21,315.88 : x
  2. Step 2: Convert to fraction form
    28,262.44/42,315.90 = 21,315.88/x
  3. Step 3: Cross multiply
    28,262.44x = 42,315.90 × 21,315.88
  4. Step 4: Simplify right side
    28,262.44x = 902,000,646.49
  5. Step 5: Solve for x
    x = 902,000,646.49/28,262.44
  6. Step 6: Final answer
    x = 31,915.17

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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.