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Finding the Fourth Proportional to 1,018.73, 1,520.40 and 920.32

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Solution

The fourth proportional to 1,018.73, 1,520.40 and 920.32 is: 1,373.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.73 : 1,520.40 = 920.32 : x
  2. Step 2: Convert to fraction form
    1,018.73/1,520.40 = 920.32/x
  3. Step 3: Cross multiply
    1,018.73x = 1,520.40 × 920.32
  4. Step 4: Simplify right side
    1,018.73x = 1,399,250.73
  5. Step 5: Solve for x
    x = 1,399,250.73/1,018.73
  6. Step 6: Final answer
    x = 1,373.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.