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Finding the Fourth Proportional to 804.87, 1,111.32 and 711.72

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Solution

The fourth proportional to 804.87, 1,111.32 and 711.72 is: 982.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.87 : 1,111.32 = 711.72 : x
  2. Step 2: Convert to fraction form
    804.87/1,111.32 = 711.72/x
  3. Step 3: Cross multiply
    804.87x = 1,111.32 × 711.72
  4. Step 4: Simplify right side
    804.87x = 790,948.67
  5. Step 5: Solve for x
    x = 790,948.67/804.87
  6. Step 6: Final answer
    x = 982.70

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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.