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Finding the Fourth Proportional to 18,778.20, 28,165.47 and 4,927.20

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Solution

The fourth proportional to 18,778.20, 28,165.47 and 4,927.20 is: 7,390.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,778.20 : 28,165.47 = 4,927.20 : x
  2. Step 2: Convert to fraction form
    18,778.20/28,165.47 = 4,927.20/x
  3. Step 3: Cross multiply
    18,778.20x = 28,165.47 × 4,927.20
  4. Step 4: Simplify right side
    18,778.20x = 138,776,779.69
  5. Step 5: Solve for x
    x = 138,776,779.69/18,778.20
  6. Step 6: Final answer
    x = 7,390.31

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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.