Home / 20,784.36-31,168.80-9,688.80

Finding the Fourth Proportional to 20,784.36, 31,168.80 and 9,688.80

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Solution

The fourth proportional to 20,784.36, 31,168.80 and 9,688.80 is: 14,529.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,784.36 : 31,168.80 = 9,688.80 : x
  2. Step 2: Convert to fraction form
    20,784.36/31,168.80 = 9,688.80/x
  3. Step 3: Cross multiply
    20,784.36x = 31,168.80 × 9,688.80
  4. Step 4: Simplify right side
    20,784.36x = 301,988,269.44
  5. Step 5: Solve for x
    x = 301,988,269.44/20,784.36
  6. Step 6: Final answer
    x = 14,529.59

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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.