Home / 21,985.15-30,339.51-12,908.73

Finding the Fourth Proportional to 21,985.15, 30,339.51 and 12,908.73

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Solution

The fourth proportional to 21,985.15, 30,339.51 and 12,908.73 is: 17,814.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,985.15 : 30,339.51 = 12,908.73 : x
  2. Step 2: Convert to fraction form
    21,985.15/30,339.51 = 12,908.73/x
  3. Step 3: Cross multiply
    21,985.15x = 30,339.51 × 12,908.73
  4. Step 4: Simplify right side
    21,985.15x = 391,644,542.92
  5. Step 5: Solve for x
    x = 391,644,542.92/21,985.15
  6. Step 6: Final answer
    x = 17,814.05

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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.