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Finding the Fourth Proportional to 12,985.13, 17,919.48 and 7,397.21

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Solution

The fourth proportional to 12,985.13, 17,919.48 and 7,397.21 is: 10,208.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.13 : 17,919.48 = 7,397.21 : x
  2. Step 2: Convert to fraction form
    12,985.13/17,919.48 = 7,397.21/x
  3. Step 3: Cross multiply
    12,985.13x = 17,919.48 × 7,397.21
  4. Step 4: Simplify right side
    12,985.13x = 132,554,067.05
  5. Step 5: Solve for x
    x = 132,554,067.05/12,985.13
  6. Step 6: Final answer
    x = 10,208.15

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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.