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Finding the Fourth Proportional to 19,230.40, 28,874.40 and 13,412.80

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Solution

The fourth proportional to 19,230.40, 28,874.40 and 13,412.80 is: 20,139.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,230.40 : 28,874.40 = 13,412.80 : x
  2. Step 2: Convert to fraction form
    19,230.40/28,874.40 = 13,412.80/x
  3. Step 3: Cross multiply
    19,230.40x = 28,874.40 × 13,412.80
  4. Step 4: Simplify right side
    19,230.40x = 387,286,552.32
  5. Step 5: Solve for x
    x = 387,286,552.32/19,230.40
  6. Step 6: Final answer
    x = 20,139.29

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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.