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Finding the Fourth Proportional to 805.57, 1,111.29 and 543.13

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Solution

The fourth proportional to 805.57, 1,111.29 and 543.13 is: 749.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.57 : 1,111.29 = 543.13 : x
  2. Step 2: Convert to fraction form
    805.57/1,111.29 = 543.13/x
  3. Step 3: Cross multiply
    805.57x = 1,111.29 × 543.13
  4. Step 4: Simplify right side
    805.57x = 603,574.94
  5. Step 5: Solve for x
    x = 603,574.94/805.57
  6. Step 6: Final answer
    x = 749.25

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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.