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Finding the Fourth Proportional to 15,911.52, 21,960 and 9,622.68

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Solution

The fourth proportional to 15,911.52, 21,960 and 9,622.68 is: 13,280.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,911.52 : 21,960 = 9,622.68 : x
  2. Step 2: Convert to fraction form
    15,911.52/21,960 = 9,622.68/x
  3. Step 3: Cross multiply
    15,911.52x = 21,960 × 9,622.68
  4. Step 4: Simplify right side
    15,911.52x = 211,314,052.80
  5. Step 5: Solve for x
    x = 211,314,052.80/15,911.52
  6. Step 6: Final answer
    x = 13,280.57

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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.