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Finding the Fourth Proportional to 18,621.20, 25,697.40 and 10,123.40

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Solution

The fourth proportional to 18,621.20, 25,697.40 and 10,123.40 is: 13,970.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,621.20 : 25,697.40 = 10,123.40 : x
  2. Step 2: Convert to fraction form
    18,621.20/25,697.40 = 10,123.40/x
  3. Step 3: Cross multiply
    18,621.20x = 25,697.40 × 10,123.40
  4. Step 4: Simplify right side
    18,621.20x = 260,145,059.16
  5. Step 5: Solve for x
    x = 260,145,059.16/18,621.20
  6. Step 6: Final answer
    x = 13,970.37

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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.