Home / 15,690.90-21,659.61-9,402.06

Finding the Fourth Proportional to 15,690.90, 21,659.61 and 9,402.06

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Solution

The fourth proportional to 15,690.90, 21,659.61 and 9,402.06 is: 12,978.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.90 : 21,659.61 = 9,402.06 : x
  2. Step 2: Convert to fraction form
    15,690.90/21,659.61 = 9,402.06/x
  3. Step 3: Cross multiply
    15,690.90x = 21,659.61 × 9,402.06
  4. Step 4: Simplify right side
    15,690.90x = 203,644,952.80
  5. Step 5: Solve for x
    x = 203,644,952.80/15,690.90
  6. Step 6: Final answer
    x = 12,978.54

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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.