Home / 15,402.09-21,255.03-8,687.40

Finding the Fourth Proportional to 15,402.09, 21,255.03 and 8,687.40

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Solution

The fourth proportional to 15,402.09, 21,255.03 and 8,687.40 is: 11,988.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,402.09 : 21,255.03 = 8,687.40 : x
  2. Step 2: Convert to fraction form
    15,402.09/21,255.03 = 8,687.40/x
  3. Step 3: Cross multiply
    15,402.09x = 21,255.03 × 8,687.40
  4. Step 4: Simplify right side
    15,402.09x = 184,650,947.62
  5. Step 5: Solve for x
    x = 184,650,947.62/15,402.09
  6. Step 6: Final answer
    x = 11,988.69

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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.