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Finding the Fourth Proportional to 15,886.31, 21,937.05 and 9,928.13

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Solution

The fourth proportional to 15,886.31, 21,937.05 and 9,928.13 is: 13,709.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.31 : 21,937.05 = 9,928.13 : x
  2. Step 2: Convert to fraction form
    15,886.31/21,937.05 = 9,928.13/x
  3. Step 3: Cross multiply
    15,886.31x = 21,937.05 × 9,928.13
  4. Step 4: Simplify right side
    15,886.31x = 217,793,774.53
  5. Step 5: Solve for x
    x = 217,793,774.53/15,886.31
  6. Step 6: Final answer
    x = 13,709.53

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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.