Home / 13,981.65-20,985.66-5,105.58

Finding the Fourth Proportional to 13,981.65, 20,985.66 and 5,105.58

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Solution

The fourth proportional to 13,981.65, 20,985.66 and 5,105.58 is: 7,663.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.65 : 20,985.66 = 5,105.58 : x
  2. Step 2: Convert to fraction form
    13,981.65/20,985.66 = 5,105.58/x
  3. Step 3: Cross multiply
    13,981.65x = 20,985.66 × 5,105.58
  4. Step 4: Simplify right side
    13,981.65x = 107,143,965.98
  5. Step 5: Solve for x
    x = 107,143,965.98/13,981.65
  6. Step 6: Final answer
    x = 7,663.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.