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Finding the Fourth Proportional to 19,292.80, 28,939.20 and 10,998.40

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Solution

The fourth proportional to 19,292.80, 28,939.20 and 10,998.40 is: 16,497.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,292.80 : 28,939.20 = 10,998.40 : x
  2. Step 2: Convert to fraction form
    19,292.80/28,939.20 = 10,998.40/x
  3. Step 3: Cross multiply
    19,292.80x = 28,939.20 × 10,998.40
  4. Step 4: Simplify right side
    19,292.80x = 318,284,897.28
  5. Step 5: Solve for x
    x = 318,284,897.28/19,292.80
  6. Step 6: Final answer
    x = 16,497.60

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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.