Home / 20,781.77-28,715.51-15,396.48

Finding the Fourth Proportional to 20,781.77, 28,715.51 and 15,396.48

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Solution

The fourth proportional to 20,781.77, 28,715.51 and 15,396.48 is: 21,274.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.77 : 28,715.51 = 15,396.48 : x
  2. Step 2: Convert to fraction form
    20,781.77/28,715.51 = 15,396.48/x
  3. Step 3: Cross multiply
    20,781.77x = 28,715.51 × 15,396.48
  4. Step 4: Simplify right side
    20,781.77x = 442,117,813.90
  5. Step 5: Solve for x
    x = 442,117,813.90/20,781.77
  6. Step 6: Final answer
    x = 21,274.31

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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.