Home / 15,860.28-21,887.37-8,690.40

Finding the Fourth Proportional to 15,860.28, 21,887.37 and 8,690.40

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Solution

The fourth proportional to 15,860.28, 21,887.37 and 8,690.40 is: 11,992.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.28 : 21,887.37 = 8,690.40 : x
  2. Step 2: Convert to fraction form
    15,860.28/21,887.37 = 8,690.40/x
  3. Step 3: Cross multiply
    15,860.28x = 21,887.37 × 8,690.40
  4. Step 4: Simplify right side
    15,860.28x = 190,210,000.25
  5. Step 5: Solve for x
    x = 190,210,000.25/15,860.28
  6. Step 6: Final answer
    x = 11,992.85

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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.