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Finding the Fourth Proportional to 12,411.40, 18,638.70 and 8,739.40

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Solution

The fourth proportional to 12,411.40, 18,638.70 and 8,739.40 is: 13,124.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,411.40 : 18,638.70 = 8,739.40 : x
  2. Step 2: Convert to fraction form
    12,411.40/18,638.70 = 8,739.40/x
  3. Step 3: Cross multiply
    12,411.40x = 18,638.70 × 8,739.40
  4. Step 4: Simplify right side
    12,411.40x = 162,891,054.78
  5. Step 5: Solve for x
    x = 162,891,054.78/12,411.40
  6. Step 6: Final answer
    x = 13,124.31

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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.