Home / 20,989.08-28,966.14-11,557.80

Finding the Fourth Proportional to 20,989.08, 28,966.14 and 11,557.80

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Solution

The fourth proportional to 20,989.08, 28,966.14 and 11,557.80 is: 15,950.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.08 : 28,966.14 = 11,557.80 : x
  2. Step 2: Convert to fraction form
    20,989.08/28,966.14 = 11,557.80/x
  3. Step 3: Cross multiply
    20,989.08x = 28,966.14 × 11,557.80
  4. Step 4: Simplify right side
    20,989.08x = 334,784,852.89
  5. Step 5: Solve for x
    x = 334,784,852.89/20,989.08
  6. Step 6: Final answer
    x = 15,950.43

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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.