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Finding the Fourth Proportional to 15,856.35, 21,861.01 and 13,642.01

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Solution

The fourth proportional to 15,856.35, 21,861.01 and 13,642.01 is: 18,808.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.35 : 21,861.01 = 13,642.01 : x
  2. Step 2: Convert to fraction form
    15,856.35/21,861.01 = 13,642.01/x
  3. Step 3: Cross multiply
    15,856.35x = 21,861.01 × 13,642.01
  4. Step 4: Simplify right side
    15,856.35x = 298,228,117.03
  5. Step 5: Solve for x
    x = 298,228,117.03/15,856.35
  6. Step 6: Final answer
    x = 18,808.12

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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.