Home / 20,918.76-31,390.38-7,780.20

Finding the Fourth Proportional to 20,918.76, 31,390.38 and 7,780.20

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Solution

The fourth proportional to 20,918.76, 31,390.38 and 7,780.20 is: 11,674.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.76 : 31,390.38 = 7,780.20 : x
  2. Step 2: Convert to fraction form
    20,918.76/31,390.38 = 7,780.20/x
  3. Step 3: Cross multiply
    20,918.76x = 31,390.38 × 7,780.20
  4. Step 4: Simplify right side
    20,918.76x = 244,223,434.48
  5. Step 5: Solve for x
    x = 244,223,434.48/20,918.76
  6. Step 6: Final answer
    x = 11,674.85

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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.