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Finding the Fourth Proportional to 1,191.51, 1,643.22 and 862.11

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Solution

The fourth proportional to 1,191.51, 1,643.22 and 862.11 is: 1,188.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.51 : 1,643.22 = 862.11 : x
  2. Step 2: Convert to fraction form
    1,191.51/1,643.22 = 862.11/x
  3. Step 3: Cross multiply
    1,191.51x = 1,643.22 × 862.11
  4. Step 4: Simplify right side
    1,191.51x = 1,416,636.39
  5. Step 5: Solve for x
    x = 1,416,636.39/1,191.51
  6. Step 6: Final answer
    x = 1,188.94

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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.