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Finding the Fourth Proportional to 1,018.31, 1,405.26 and 576.20

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Solution

The fourth proportional to 1,018.31, 1,405.26 and 576.20 is: 795.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.31 : 1,405.26 = 576.20 : x
  2. Step 2: Convert to fraction form
    1,018.31/1,405.26 = 576.20/x
  3. Step 3: Cross multiply
    1,018.31x = 1,405.26 × 576.20
  4. Step 4: Simplify right side
    1,018.31x = 809,708.74
  5. Step 5: Solve for x
    x = 809,708.74/1,018.31
  6. Step 6: Final answer
    x = 795.15

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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.