Home / 20,964.78-28,931.34-12,581.28

Finding the Fourth Proportional to 20,964.78, 28,931.34 and 12,581.28

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Solution

The fourth proportional to 20,964.78, 28,931.34 and 12,581.28 is: 17,362.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,964.78 : 28,931.34 = 12,581.28 : x
  2. Step 2: Convert to fraction form
    20,964.78/28,931.34 = 12,581.28/x
  3. Step 3: Cross multiply
    20,964.78x = 28,931.34 × 12,581.28
  4. Step 4: Simplify right side
    20,964.78x = 363,993,289.32
  5. Step 5: Solve for x
    x = 363,993,289.32/20,964.78
  6. Step 6: Final answer
    x = 17,362.13

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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.