Home / 20,719.88-31,029.90-12,918.92

Finding the Fourth Proportional to 20,719.88, 31,029.90 and 12,918.92

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Solution

The fourth proportional to 20,719.88, 31,029.90 and 12,918.92 is: 19,347.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.88 : 31,029.90 = 12,918.92 : x
  2. Step 2: Convert to fraction form
    20,719.88/31,029.90 = 12,918.92/x
  3. Step 3: Cross multiply
    20,719.88x = 31,029.90 × 12,918.92
  4. Step 4: Simplify right side
    20,719.88x = 400,872,795.71
  5. Step 5: Solve for x
    x = 400,872,795.71/20,719.88
  6. Step 6: Final answer
    x = 19,347.25

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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.