Home / 20,990.52-28,966.96-11,559.10

Finding the Fourth Proportional to 20,990.52, 28,966.96 and 11,559.10

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Solution

The fourth proportional to 20,990.52, 28,966.96 and 11,559.10 is: 15,951.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.52 : 28,966.96 = 11,559.10 : x
  2. Step 2: Convert to fraction form
    20,990.52/28,966.96 = 11,559.10/x
  3. Step 3: Cross multiply
    20,990.52x = 28,966.96 × 11,559.10
  4. Step 4: Simplify right side
    20,990.52x = 334,831,987.34
  5. Step 5: Solve for x
    x = 334,831,987.34/20,990.52
  6. Step 6: Final answer
    x = 15,951.58

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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.