Home / 20,989.50-28,965.54-11,558.70

Finding the Fourth Proportional to 20,989.50, 28,965.54 and 11,558.70

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Solution

The fourth proportional to 20,989.50, 28,965.54 and 11,558.70 is: 15,951.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.50 : 28,965.54 = 11,558.70 : x
  2. Step 2: Convert to fraction form
    20,989.50/28,965.54 = 11,558.70/x
  3. Step 3: Cross multiply
    20,989.50x = 28,965.54 × 11,558.70
  4. Step 4: Simplify right side
    20,989.50x = 334,803,987.20
  5. Step 5: Solve for x
    x = 334,803,987.20/20,989.50
  6. Step 6: Final answer
    x = 15,951.02

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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.