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Finding the Fourth Proportional to 18,379.20, 25,363.20 and 13,670.40

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Solution

The fourth proportional to 18,379.20, 25,363.20 and 13,670.40 is: 18,865.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,379.20 : 25,363.20 = 13,670.40 : x
  2. Step 2: Convert to fraction form
    18,379.20/25,363.20 = 13,670.40/x
  3. Step 3: Cross multiply
    18,379.20x = 25,363.20 × 13,670.40
  4. Step 4: Simplify right side
    18,379.20x = 346,725,089.28
  5. Step 5: Solve for x
    x = 346,725,089.28/18,379.20
  6. Step 6: Final answer
    x = 18,865.08

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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.