Home / 13,985.65-20,991.66-5,109.58

Finding the Fourth Proportional to 13,985.65, 20,991.66 and 5,109.58

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Solution

The fourth proportional to 13,985.65, 20,991.66 and 5,109.58 is: 7,669.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.65 : 20,991.66 = 5,109.58 : x
  2. Step 2: Convert to fraction form
    13,985.65/20,991.66 = 5,109.58/x
  3. Step 3: Cross multiply
    13,985.65x = 20,991.66 × 5,109.58
  4. Step 4: Simplify right side
    13,985.65x = 107,258,566.10
  5. Step 5: Solve for x
    x = 107,258,566.10/13,985.65
  6. Step 6: Final answer
    x = 7,669.19

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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.