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Finding the Fourth Proportional to 807.88, 1,115.48 and 513.84

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Solution

The fourth proportional to 807.88, 1,115.48 and 513.84 is: 709.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.88 : 1,115.48 = 513.84 : x
  2. Step 2: Convert to fraction form
    807.88/1,115.48 = 513.84/x
  3. Step 3: Cross multiply
    807.88x = 1,115.48 × 513.84
  4. Step 4: Simplify right side
    807.88x = 573,178.24
  5. Step 5: Solve for x
    x = 573,178.24/807.88
  6. Step 6: Final answer
    x = 709.48

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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.