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Finding the Fourth Proportional to 1,018.43, 1,405.43 and 552.68

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Solution

The fourth proportional to 1,018.43, 1,405.43 and 552.68 is: 762.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.43 : 1,405.43 = 552.68 : x
  2. Step 2: Convert to fraction form
    1,018.43/1,405.43 = 552.68/x
  3. Step 3: Cross multiply
    1,018.43x = 1,405.43 × 552.68
  4. Step 4: Simplify right side
    1,018.43x = 776,754.34
  5. Step 5: Solve for x
    x = 776,754.34/1,018.43
  6. Step 6: Final answer
    x = 762.70

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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.