Home / 21,005.14-28,989.13-15,690.73

Finding the Fourth Proportional to 21,005.14, 28,989.13 and 15,690.73

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Solution

The fourth proportional to 21,005.14, 28,989.13 and 15,690.73 is: 21,654.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.14 : 28,989.13 = 15,690.73 : x
  2. Step 2: Convert to fraction form
    21,005.14/28,989.13 = 15,690.73/x
  3. Step 3: Cross multiply
    21,005.14x = 28,989.13 × 15,690.73
  4. Step 4: Simplify right side
    21,005.14x = 454,860,578.52
  5. Step 5: Solve for x
    x = 454,860,578.52/21,005.14
  6. Step 6: Final answer
    x = 21,654.73

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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.