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Finding the Fourth Proportional to 285,997.18, 428,998.61 and 86,319.22

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Solution

The fourth proportional to 285,997.18, 428,998.61 and 86,319.22 is: 129,479.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,997.18 : 428,998.61 = 86,319.22 : x
  2. Step 2: Convert to fraction form
    285,997.18/428,998.61 = 86,319.22/x
  3. Step 3: Cross multiply
    285,997.18x = 428,998.61 × 86,319.22
  4. Step 4: Simplify right side
    285,997.18x = 37,030,825,396.28
  5. Step 5: Solve for x
    x = 37,030,825,396.28/285,997.18
  6. Step 6: Final answer
    x = 129,479.69

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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.