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Finding the Fourth Proportional to 805.71, 1,111.79 and 469.51

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Solution

The fourth proportional to 805.71, 1,111.79 and 469.51 is: 647.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.71 : 1,111.79 = 469.51 : x
  2. Step 2: Convert to fraction form
    805.71/1,111.79 = 469.51/x
  3. Step 3: Cross multiply
    805.71x = 1,111.79 × 469.51
  4. Step 4: Simplify right side
    805.71x = 521,996.52
  5. Step 5: Solve for x
    x = 521,996.52/805.71
  6. Step 6: Final answer
    x = 647.87

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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.