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Finding the Fourth Proportional to 15,840, 21,858.92 and 9,125.60

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Solution

The fourth proportional to 15,840, 21,858.92 and 9,125.60 is: 12,593.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,840 : 21,858.92 = 9,125.60 : x
  2. Step 2: Convert to fraction form
    15,840/21,858.92 = 9,125.60/x
  3. Step 3: Cross multiply
    15,840x = 21,858.92 × 9,125.60
  4. Step 4: Simplify right side
    15,840x = 199,475,760.35
  5. Step 5: Solve for x
    x = 199,475,760.35/15,840
  6. Step 6: Final answer
    x = 12,593.17

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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.