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Finding the Fourth Proportional to 812.08, 1,220.40 and 557.20

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Solution

The fourth proportional to 812.08, 1,220.40 and 557.20 is: 837.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.08 : 1,220.40 = 557.20 : x
  2. Step 2: Convert to fraction form
    812.08/1,220.40 = 557.20/x
  3. Step 3: Cross multiply
    812.08x = 1,220.40 × 557.20
  4. Step 4: Simplify right side
    812.08x = 680,006.88
  5. Step 5: Solve for x
    x = 680,006.88/812.08
  6. Step 6: Final answer
    x = 837.36

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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.