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Finding the Fourth Proportional to 28,542.72, 42,798.36 and 8,815.80

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Solution

The fourth proportional to 28,542.72, 42,798.36 and 8,815.80 is: 13,218.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,542.72 : 42,798.36 = 8,815.80 : x
  2. Step 2: Convert to fraction form
    28,542.72/42,798.36 = 8,815.80/x
  3. Step 3: Cross multiply
    28,542.72x = 42,798.36 × 8,815.80
  4. Step 4: Simplify right side
    28,542.72x = 377,301,782.09
  5. Step 5: Solve for x
    x = 377,301,782.09/28,542.72
  6. Step 6: Final answer
    x = 13,218.84

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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.