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Finding the Fourth Proportional to 15,291.94, 21,107.28 and 9,914.18

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Solution

The fourth proportional to 15,291.94, 21,107.28 and 9,914.18 is: 13,684.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,291.94 : 21,107.28 = 9,914.18 : x
  2. Step 2: Convert to fraction form
    15,291.94/21,107.28 = 9,914.18/x
  3. Step 3: Cross multiply
    15,291.94x = 21,107.28 × 9,914.18
  4. Step 4: Simplify right side
    15,291.94x = 209,261,373.23
  5. Step 5: Solve for x
    x = 209,261,373.23/15,291.94
  6. Step 6: Final answer
    x = 13,684.42

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Double scale
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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.