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Finding the Fourth Proportional to 28,580.40, 42,839.91 and 11,927.88

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Solution

The fourth proportional to 28,580.40, 42,839.91 and 11,927.88 is: 17,879.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,580.40 : 42,839.91 = 11,927.88 : x
  2. Step 2: Convert to fraction form
    28,580.40/42,839.91 = 11,927.88/x
  3. Step 3: Cross multiply
    28,580.40x = 42,839.91 × 11,927.88
  4. Step 4: Simplify right side
    28,580.40x = 510,989,305.69
  5. Step 5: Solve for x
    x = 510,989,305.69/28,580.40
  6. Step 6: Final answer
    x = 17,879.01

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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.