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Finding the Fourth Proportional to 1,018.56, 1,405.62 and 552.81

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Solution

The fourth proportional to 1,018.56, 1,405.62 and 552.81 is: 762.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.56 : 1,405.62 = 552.81 : x
  2. Step 2: Convert to fraction form
    1,018.56/1,405.62 = 552.81/x
  3. Step 3: Cross multiply
    1,018.56x = 1,405.62 × 552.81
  4. Step 4: Simplify right side
    1,018.56x = 777,040.79
  5. Step 5: Solve for x
    x = 777,040.79/1,018.56
  6. Step 6: Final answer
    x = 762.88

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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.