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Finding the Fourth Proportional to 28,539.72, 42,812.01 and 7,479.72

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Solution

The fourth proportional to 28,539.72, 42,812.01 and 7,479.72 is: 11,220.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,539.72 : 42,812.01 = 7,479.72 : x
  2. Step 2: Convert to fraction form
    28,539.72/42,812.01 = 7,479.72/x
  3. Step 3: Cross multiply
    28,539.72x = 42,812.01 × 7,479.72
  4. Step 4: Simplify right side
    28,539.72x = 320,221,847.44
  5. Step 5: Solve for x
    x = 320,221,847.44/28,539.72
  6. Step 6: Final answer
    x = 11,220.22

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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.