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Finding the Fourth Proportional to 15,894.21, 21,931.77 and 9,519.31

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Solution

The fourth proportional to 15,894.21, 21,931.77 and 9,519.31 is: 13,135.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,894.21 : 21,931.77 = 9,519.31 : x
  2. Step 2: Convert to fraction form
    15,894.21/21,931.77 = 9,519.31/x
  3. Step 3: Cross multiply
    15,894.21x = 21,931.77 × 9,519.31
  4. Step 4: Simplify right side
    15,894.21x = 208,775,380.59
  5. Step 5: Solve for x
    x = 208,775,380.59/15,894.21
  6. Step 6: Final answer
    x = 13,135.31

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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.