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Finding the Fourth Proportional to 1,018.46, 1,405.75 and 645.62

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Solution

The fourth proportional to 1,018.46, 1,405.75 and 645.62 is: 891.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.46 : 1,405.75 = 645.62 : x
  2. Step 2: Convert to fraction form
    1,018.46/1,405.75 = 645.62/x
  3. Step 3: Cross multiply
    1,018.46x = 1,405.75 × 645.62
  4. Step 4: Simplify right side
    1,018.46x = 907,577.09
  5. Step 5: Solve for x
    x = 907,577.09/1,018.46
  6. Step 6: Final answer
    x = 891.13

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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.