Home / 18,909.20-28,363.80-12,688.40

Finding the Fourth Proportional to 18,909.20, 28,363.80 and 12,688.40

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Solution

The fourth proportional to 18,909.20, 28,363.80 and 12,688.40 is: 19,032.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.20 : 28,363.80 = 12,688.40 : x
  2. Step 2: Convert to fraction form
    18,909.20/28,363.80 = 12,688.40/x
  3. Step 3: Cross multiply
    18,909.20x = 28,363.80 × 12,688.40
  4. Step 4: Simplify right side
    18,909.20x = 359,891,239.92
  5. Step 5: Solve for x
    x = 359,891,239.92/18,909.20
  6. Step 6: Final answer
    x = 19,032.60

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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.