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Finding the Fourth Proportional to 15,856.15, 21,881.24 and 8,686.01

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Solution

The fourth proportional to 15,856.15, 21,881.24 and 8,686.01 is: 11,986.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.15 : 21,881.24 = 8,686.01 : x
  2. Step 2: Convert to fraction form
    15,856.15/21,881.24 = 8,686.01/x
  3. Step 3: Cross multiply
    15,856.15x = 21,881.24 × 8,686.01
  4. Step 4: Simplify right side
    15,856.15x = 190,060,669.45
  5. Step 5: Solve for x
    x = 190,060,669.45/15,856.15
  6. Step 6: Final answer
    x = 11,986.56

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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.