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Finding the Fourth Proportional to 515,047.20, 772,570.80 and 215,428.20

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Solution

The fourth proportional to 515,047.20, 772,570.80 and 215,428.20 is: 323,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,047.20 : 772,570.80 = 215,428.20 : x
  2. Step 2: Convert to fraction form
    515,047.20/772,570.80 = 215,428.20/x
  3. Step 3: Cross multiply
    515,047.20x = 772,570.80 × 215,428.20
  4. Step 4: Simplify right side
    515,047.20x = 166,433,536,816.56
  5. Step 5: Solve for x
    x = 166,433,536,816.56/515,047.20
  6. Step 6: Final answer
    x = 323,142.30

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Similar ratio
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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.