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Finding the Fourth Proportional to 20,552, 28,356.81 and 12,485.42

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Solution

The fourth proportional to 20,552, 28,356.81 and 12,485.42 is: 17,226.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,552 : 28,356.81 = 12,485.42 : x
  2. Step 2: Convert to fraction form
    20,552/28,356.81 = 12,485.42/x
  3. Step 3: Cross multiply
    20,552x = 28,356.81 × 12,485.42
  4. Step 4: Simplify right side
    20,552x = 354,046,682.71
  5. Step 5: Solve for x
    x = 354,046,682.71/20,552
  6. Step 6: Final answer
    x = 17,226.87

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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.