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Finding the Fourth Proportional to 812.68, 1,216.64 and 503.60

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Solution

The fourth proportional to 812.68, 1,216.64 and 503.60 is: 753.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.68 : 1,216.64 = 503.60 : x
  2. Step 2: Convert to fraction form
    812.68/1,216.64 = 503.60/x
  3. Step 3: Cross multiply
    812.68x = 1,216.64 × 503.60
  4. Step 4: Simplify right side
    812.68x = 612,699.90
  5. Step 5: Solve for x
    x = 612,699.90/812.68
  6. Step 6: Final answer
    x = 753.93

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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.