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Finding the Fourth Proportional to 19,208.80, 28,812.12 and 5,357.80

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Solution

The fourth proportional to 19,208.80, 28,812.12 and 5,357.80 is: 8,036.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,208.80 : 28,812.12 = 5,357.80 : x
  2. Step 2: Convert to fraction form
    19,208.80/28,812.12 = 5,357.80/x
  3. Step 3: Cross multiply
    19,208.80x = 28,812.12 × 5,357.80
  4. Step 4: Simplify right side
    19,208.80x = 154,369,576.54
  5. Step 5: Solve for x
    x = 154,369,576.54/19,208.80
  6. Step 6: Final answer
    x = 8,036.40

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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.