Home / 13,999.80-19,319.78-7,712.20

Finding the Fourth Proportional to 13,999.80, 19,319.78 and 7,712.20

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Solution

The fourth proportional to 13,999.80, 19,319.78 and 7,712.20 is: 10,642.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.80 : 19,319.78 = 7,712.20 : x
  2. Step 2: Convert to fraction form
    13,999.80/19,319.78 = 7,712.20/x
  3. Step 3: Cross multiply
    13,999.80x = 19,319.78 × 7,712.20
  4. Step 4: Simplify right side
    13,999.80x = 148,998,007.32
  5. Step 5: Solve for x
    x = 148,998,007.32/13,999.80
  6. Step 6: Final answer
    x = 10,642.87

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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.