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Finding the Fourth Proportional to 807.90, 1,115.15 and 493.35

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Solution

The fourth proportional to 807.90, 1,115.15 and 493.35 is: 680.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.90 : 1,115.15 = 493.35 : x
  2. Step 2: Convert to fraction form
    807.90/1,115.15 = 493.35/x
  3. Step 3: Cross multiply
    807.90x = 1,115.15 × 493.35
  4. Step 4: Simplify right side
    807.90x = 550,159.25
  5. Step 5: Solve for x
    x = 550,159.25/807.90
  6. Step 6: Final answer
    x = 680.97

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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.