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Finding the Fourth Proportional to 808.56, 1,115.16 and 513.48

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Solution

The fourth proportional to 808.56, 1,115.16 and 513.48 is: 708.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.56 : 1,115.16 = 513.48 : x
  2. Step 2: Convert to fraction form
    808.56/1,115.16 = 513.48/x
  3. Step 3: Cross multiply
    808.56x = 1,115.16 × 513.48
  4. Step 4: Simplify right side
    808.56x = 572,612.36
  5. Step 5: Solve for x
    x = 572,612.36/808.56
  6. Step 6: Final answer
    x = 708.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.