Home / 20,685.36-31,009.52-10,149.60

Finding the Fourth Proportional to 20,685.36, 31,009.52 and 10,149.60

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Solution

The fourth proportional to 20,685.36, 31,009.52 and 10,149.60 is: 15,215.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.36 : 31,009.52 = 10,149.60 : x
  2. Step 2: Convert to fraction form
    20,685.36/31,009.52 = 10,149.60/x
  3. Step 3: Cross multiply
    20,685.36x = 31,009.52 × 10,149.60
  4. Step 4: Simplify right side
    20,685.36x = 314,734,224.19
  5. Step 5: Solve for x
    x = 314,734,224.19/20,685.36
  6. Step 6: Final answer
    x = 15,215.31

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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.