Home / 20,989.90-28,967.39-11,558.47

Finding the Fourth Proportional to 20,989.90, 28,967.39 and 11,558.47

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Solution

The fourth proportional to 20,989.90, 28,967.39 and 11,558.47 is: 15,951.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.90 : 28,967.39 = 11,558.47 : x
  2. Step 2: Convert to fraction form
    20,989.90/28,967.39 = 11,558.47/x
  3. Step 3: Cross multiply
    20,989.90x = 28,967.39 × 11,558.47
  4. Step 4: Simplify right side
    20,989.90x = 334,818,708.29
  5. Step 5: Solve for x
    x = 334,818,708.29/20,989.90
  6. Step 6: Final answer
    x = 15,951.42

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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.