Home / 20,989.01-28,964.70-11,557.50

Finding the Fourth Proportional to 20,989.01, 28,964.70 and 11,557.50

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Solution

The fourth proportional to 20,989.01, 28,964.70 and 11,557.50 is: 15,949.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.01 : 28,964.70 = 11,557.50 : x
  2. Step 2: Convert to fraction form
    20,989.01/28,964.70 = 11,557.50/x
  3. Step 3: Cross multiply
    20,989.01x = 28,964.70 × 11,557.50
  4. Step 4: Simplify right side
    20,989.01x = 334,759,520.25
  5. Step 5: Solve for x
    x = 334,759,520.25/20,989.01
  6. Step 6: Final answer
    x = 15,949.28

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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.