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Finding the Fourth Proportional to 1,018.58, 1,405.32 and 620.21

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Solution

The fourth proportional to 1,018.58, 1,405.32 and 620.21 is: 855.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.58 : 1,405.32 = 620.21 : x
  2. Step 2: Convert to fraction form
    1,018.58/1,405.32 = 620.21/x
  3. Step 3: Cross multiply
    1,018.58x = 1,405.32 × 620.21
  4. Step 4: Simplify right side
    1,018.58x = 871,594.70
  5. Step 5: Solve for x
    x = 871,594.70/1,018.58
  6. Step 6: Final answer
    x = 855.70

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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.