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Finding the Fourth Proportional to 805.68, 1,111.75 and 506.86

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Solution

The fourth proportional to 805.68, 1,111.75 and 506.86 is: 699.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.68 : 1,111.75 = 506.86 : x
  2. Step 2: Convert to fraction form
    805.68/1,111.75 = 506.86/x
  3. Step 3: Cross multiply
    805.68x = 1,111.75 × 506.86
  4. Step 4: Simplify right side
    805.68x = 563,501.61
  5. Step 5: Solve for x
    x = 563,501.61/805.68
  6. Step 6: Final answer
    x = 699.41

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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.