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Finding the Fourth Proportional to 12,345.40, 18,520.80 and 6,108.40

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Solution

The fourth proportional to 12,345.40, 18,520.80 and 6,108.40 is: 9,163.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.40 : 18,520.80 = 6,108.40 : x
  2. Step 2: Convert to fraction form
    12,345.40/18,520.80 = 6,108.40/x
  3. Step 3: Cross multiply
    12,345.40x = 18,520.80 × 6,108.40
  4. Step 4: Simplify right side
    12,345.40x = 113,132,454.72
  5. Step 5: Solve for x
    x = 113,132,454.72/12,345.40
  6. Step 6: Final answer
    x = 9,163.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.