Home / 20,917.78-31,345.51-11,560.47

Finding the Fourth Proportional to 20,917.78, 31,345.51 and 11,560.47

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Solution

The fourth proportional to 20,917.78, 31,345.51 and 11,560.47 is: 17,323.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.78 : 31,345.51 = 11,560.47 : x
  2. Step 2: Convert to fraction form
    20,917.78/31,345.51 = 11,560.47/x
  3. Step 3: Cross multiply
    20,917.78x = 31,345.51 × 11,560.47
  4. Step 4: Simplify right side
    20,917.78x = 362,368,827.99
  5. Step 5: Solve for x
    x = 362,368,827.99/20,917.78
  6. Step 6: Final answer
    x = 17,323.48

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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.