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Finding the Fourth Proportional to 1,026.54, 1,539.45 and 820.62

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Solution

The fourth proportional to 1,026.54, 1,539.45 and 820.62 is: 1,230.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,026.54 : 1,539.45 = 820.62 : x
  2. Step 2: Convert to fraction form
    1,026.54/1,539.45 = 820.62/x
  3. Step 3: Cross multiply
    1,026.54x = 1,539.45 × 820.62
  4. Step 4: Simplify right side
    1,026.54x = 1,263,303.46
  5. Step 5: Solve for x
    x = 1,263,303.46/1,026.54
  6. Step 6: Final answer
    x = 1,230.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.