Home / 20,406.98-28,159.47-11,455.47

Finding the Fourth Proportional to 20,406.98, 28,159.47 and 11,455.47

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Solution

The fourth proportional to 20,406.98, 28,159.47 and 11,455.47 is: 15,807.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.98 : 28,159.47 = 11,455.47 : x
  2. Step 2: Convert to fraction form
    20,406.98/28,159.47 = 11,455.47/x
  3. Step 3: Cross multiply
    20,406.98x = 28,159.47 × 11,455.47
  4. Step 4: Simplify right side
    20,406.98x = 322,579,765.73
  5. Step 5: Solve for x
    x = 322,579,765.73/20,406.98
  6. Step 6: Final answer
    x = 15,807.33

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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.