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Finding the Fourth Proportional to 15,361.98, 21,195.75 and 9,391.47

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Solution

The fourth proportional to 15,361.98, 21,195.75 and 9,391.47 is: 12,957.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,361.98 : 21,195.75 = 9,391.47 : x
  2. Step 2: Convert to fraction form
    15,361.98/21,195.75 = 9,391.47/x
  3. Step 3: Cross multiply
    15,361.98x = 21,195.75 × 9,391.47
  4. Step 4: Simplify right side
    15,361.98x = 199,059,250.25
  5. Step 5: Solve for x
    x = 199,059,250.25/15,361.98
  6. Step 6: Final answer
    x = 12,957.92

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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.