Home / 20,918.78-31,193.64-18,015.74

Finding the Fourth Proportional to 20,918.78, 31,193.64 and 18,015.74

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Solution

The fourth proportional to 20,918.78, 31,193.64 and 18,015.74 is: 26,864.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.78 : 31,193.64 = 18,015.74 : x
  2. Step 2: Convert to fraction form
    20,918.78/31,193.64 = 18,015.74/x
  3. Step 3: Cross multiply
    20,918.78x = 31,193.64 × 18,015.74
  4. Step 4: Simplify right side
    20,918.78x = 561,976,507.89
  5. Step 5: Solve for x
    x = 561,976,507.89/20,918.78
  6. Step 6: Final answer
    x = 26,864.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.