Home / 13,875.12-20,815.47-5,109.84

Finding the Fourth Proportional to 13,875.12, 20,815.47 and 5,109.84

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Solution

The fourth proportional to 13,875.12, 20,815.47 and 5,109.84 is: 7,665.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,875.12 : 20,815.47 = 5,109.84 : x
  2. Step 2: Convert to fraction form
    13,875.12/20,815.47 = 5,109.84/x
  3. Step 3: Cross multiply
    13,875.12x = 20,815.47 × 5,109.84
  4. Step 4: Simplify right side
    13,875.12x = 106,363,721.22
  5. Step 5: Solve for x
    x = 106,363,721.22/13,875.12
  6. Step 6: Final answer
    x = 7,665.79

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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.