Home / 20,865.36-31,280.22-7,715.28

Finding the Fourth Proportional to 20,865.36, 31,280.22 and 7,715.28

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Solution

The fourth proportional to 20,865.36, 31,280.22 and 7,715.28 is: 11,566.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.36 : 31,280.22 = 7,715.28 : x
  2. Step 2: Convert to fraction form
    20,865.36/31,280.22 = 7,715.28/x
  3. Step 3: Cross multiply
    20,865.36x = 31,280.22 × 7,715.28
  4. Step 4: Simplify right side
    20,865.36x = 241,335,655.76
  5. Step 5: Solve for x
    x = 241,335,655.76/20,865.36
  6. Step 6: Final answer
    x = 11,566.33

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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.