Home / 20,967.78-31,455.16-10,438.36

Finding the Fourth Proportional to 20,967.78, 31,455.16 and 10,438.36

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Solution

The fourth proportional to 20,967.78, 31,455.16 and 10,438.36 is: 15,659.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,967.78 : 31,455.16 = 10,438.36 : x
  2. Step 2: Convert to fraction form
    20,967.78/31,455.16 = 10,438.36/x
  3. Step 3: Cross multiply
    20,967.78x = 31,455.16 × 10,438.36
  4. Step 4: Simplify right side
    20,967.78x = 328,340,283.94
  5. Step 5: Solve for x
    x = 328,340,283.94/20,967.78
  6. Step 6: Final answer
    x = 15,659.28

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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.