Home / 12,720.50-17,555.19-7,055.79

Finding the Fourth Proportional to 12,720.50, 17,555.19 and 7,055.79

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Solution

The fourth proportional to 12,720.50, 17,555.19 and 7,055.79 is: 9,737.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.50 : 17,555.19 = 7,055.79 : x
  2. Step 2: Convert to fraction form
    12,720.50/17,555.19 = 7,055.79/x
  3. Step 3: Cross multiply
    12,720.50x = 17,555.19 × 7,055.79
  4. Step 4: Simplify right side
    12,720.50x = 123,865,734.05
  5. Step 5: Solve for x
    x = 123,865,734.05/12,720.50
  6. Step 6: Final answer
    x = 9,737.49

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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.