Home / 13,781.57-19,018.17-7,813.80

Finding the Fourth Proportional to 13,781.57, 19,018.17 and 7,813.80

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Solution

The fourth proportional to 13,781.57, 19,018.17 and 7,813.80 is: 10,782.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.57 : 19,018.17 = 7,813.80 : x
  2. Step 2: Convert to fraction form
    13,781.57/19,018.17 = 7,813.80/x
  3. Step 3: Cross multiply
    13,781.57x = 19,018.17 × 7,813.80
  4. Step 4: Simplify right side
    13,781.57x = 148,604,176.75
  5. Step 5: Solve for x
    x = 148,604,176.75/13,781.57
  6. Step 6: Final answer
    x = 10,782.82

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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.