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Finding the Fourth Proportional to 18,372.70, 25,345.65 and 12,406.30

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Solution

The fourth proportional to 18,372.70, 25,345.65 and 12,406.30 is: 17,114.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,372.70 : 25,345.65 = 12,406.30 : x
  2. Step 2: Convert to fraction form
    18,372.70/25,345.65 = 12,406.30/x
  3. Step 3: Cross multiply
    18,372.70x = 25,345.65 × 12,406.30
  4. Step 4: Simplify right side
    18,372.70x = 314,445,737.60
  5. Step 5: Solve for x
    x = 314,445,737.60/18,372.70
  6. Step 6: Final answer
    x = 17,114.84

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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.