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Finding the Fourth Proportional to 1,262, 1,740.36 and 820.24

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Solution

The fourth proportional to 1,262, 1,740.36 and 820.24 is: 1,131.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262 : 1,740.36 = 820.24 : x
  2. Step 2: Convert to fraction form
    1,262/1,740.36 = 820.24/x
  3. Step 3: Cross multiply
    1,262x = 1,740.36 × 820.24
  4. Step 4: Simplify right side
    1,262x = 1,427,512.89
  5. Step 5: Solve for x
    x = 1,427,512.89/1,262
  6. Step 6: Final answer
    x = 1,131.15

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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.