Home / 20,990.84-28,963.14-15,953.72

Finding the Fourth Proportional to 20,990.84, 28,963.14 and 15,953.72

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Solution

The fourth proportional to 20,990.84, 28,963.14 and 15,953.72 is: 22,012.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.84 : 28,963.14 = 15,953.72 : x
  2. Step 2: Convert to fraction form
    20,990.84/28,963.14 = 15,953.72/x
  3. Step 3: Cross multiply
    20,990.84x = 28,963.14 × 15,953.72
  4. Step 4: Simplify right side
    20,990.84x = 462,069,825.88
  5. Step 5: Solve for x
    x = 462,069,825.88/20,990.84
  6. Step 6: Final answer
    x = 22,012.93

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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.