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Finding the Fourth Proportional to 18,913.74, 28,341.34 and 12,993.48

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Solution

The fourth proportional to 18,913.74, 28,341.34 and 12,993.48 is: 19,470.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.74 : 28,341.34 = 12,993.48 : x
  2. Step 2: Convert to fraction form
    18,913.74/28,341.34 = 12,993.48/x
  3. Step 3: Cross multiply
    18,913.74x = 28,341.34 × 12,993.48
  4. Step 4: Simplify right side
    18,913.74x = 368,252,634.46
  5. Step 5: Solve for x
    x = 368,252,634.46/18,913.74
  6. Step 6: Final answer
    x = 19,470.11

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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.