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Finding the Fourth Proportional to 805.47, 1,111.62 and 490.65

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Solution

The fourth proportional to 805.47, 1,111.62 and 490.65 is: 677.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.47 : 1,111.62 = 490.65 : x
  2. Step 2: Convert to fraction form
    805.47/1,111.62 = 490.65/x
  3. Step 3: Cross multiply
    805.47x = 1,111.62 × 490.65
  4. Step 4: Simplify right side
    805.47x = 545,416.35
  5. Step 5: Solve for x
    x = 545,416.35/805.47
  6. Step 6: Final answer
    x = 677.14

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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.