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Finding the Fourth Proportional to 1,186.76, 1,638.50 and 1,062.20

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Solution

The fourth proportional to 1,186.76, 1,638.50 and 1,062.20 is: 1,466.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.76 : 1,638.50 = 1,062.20 : x
  2. Step 2: Convert to fraction form
    1,186.76/1,638.50 = 1,062.20/x
  3. Step 3: Cross multiply
    1,186.76x = 1,638.50 × 1,062.20
  4. Step 4: Simplify right side
    1,186.76x = 1,740,416.14
  5. Step 5: Solve for x
    x = 1,740,416.14/1,186.76
  6. Step 6: Final answer
    x = 1,466.53

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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.