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Finding the Fourth Proportional to 28,555.52, 42,832.64 and 7,779.20

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Solution

The fourth proportional to 28,555.52, 42,832.64 and 7,779.20 is: 11,668.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,555.52 : 42,832.64 = 7,779.20 : x
  2. Step 2: Convert to fraction form
    28,555.52/42,832.64 = 7,779.20/x
  3. Step 3: Cross multiply
    28,555.52x = 42,832.64 × 7,779.20
  4. Step 4: Simplify right side
    28,555.52x = 333,203,673.09
  5. Step 5: Solve for x
    x = 333,203,673.09/28,555.52
  6. Step 6: Final answer
    x = 11,668.63

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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.