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Finding the Fourth Proportional to 20,962.78, 28,928 and 11,531.34

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Solution

The fourth proportional to 20,962.78, 28,928 and 11,531.34 is: 15,912.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,962.78 : 28,928 = 11,531.34 : x
  2. Step 2: Convert to fraction form
    20,962.78/28,928 = 11,531.34/x
  3. Step 3: Cross multiply
    20,962.78x = 28,928 × 11,531.34
  4. Step 4: Simplify right side
    20,962.78x = 333,578,603.52
  5. Step 5: Solve for x
    x = 333,578,603.52/20,962.78
  6. Step 6: Final answer
    x = 15,912.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.