Home / 20,989.16-28,964.98-11,557.72

Finding the Fourth Proportional to 20,989.16, 28,964.98 and 11,557.72

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Solution

The fourth proportional to 20,989.16, 28,964.98 and 11,557.72 is: 15,949.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.16 : 28,964.98 = 11,557.72 : x
  2. Step 2: Convert to fraction form
    20,989.16/28,964.98 = 11,557.72/x
  3. Step 3: Cross multiply
    20,989.16x = 28,964.98 × 11,557.72
  4. Step 4: Simplify right side
    20,989.16x = 334,769,128.65
  5. Step 5: Solve for x
    x = 334,769,128.65/20,989.16
  6. Step 6: Final answer
    x = 15,949.62

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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.