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Finding the Fourth Proportional to 864.25, 1,190.25 and 808.67

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Solution

The fourth proportional to 864.25, 1,190.25 and 808.67 is: 1,113.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.25 : 1,190.25 = 808.67 : x
  2. Step 2: Convert to fraction form
    864.25/1,190.25 = 808.67/x
  3. Step 3: Cross multiply
    864.25x = 1,190.25 × 808.67
  4. Step 4: Simplify right side
    864.25x = 962,513.52
  5. Step 5: Solve for x
    x = 962,513.52/864.25
  6. Step 6: Final answer
    x = 1,113.70

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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.