Home / 15,856.84-21,861.12-13,609

Finding the Fourth Proportional to 15,856.84, 21,861.12 and 13,609

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Solution

The fourth proportional to 15,856.84, 21,861.12 and 13,609 is: 18,762.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.84 : 21,861.12 = 13,609 : x
  2. Step 2: Convert to fraction form
    15,856.84/21,861.12 = 13,609/x
  3. Step 3: Cross multiply
    15,856.84x = 21,861.12 × 13,609
  4. Step 4: Simplify right side
    15,856.84x = 297,507,982.08
  5. Step 5: Solve for x
    x = 297,507,982.08/15,856.84
  6. Step 6: Final answer
    x = 18,762.12

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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.