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Finding the Fourth Proportional to 1,040.36, 1,435.64 and 667.35

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Solution

The fourth proportional to 1,040.36, 1,435.64 and 667.35 is: 920.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.36 : 1,435.64 = 667.35 : x
  2. Step 2: Convert to fraction form
    1,040.36/1,435.64 = 667.35/x
  3. Step 3: Cross multiply
    1,040.36x = 1,435.64 × 667.35
  4. Step 4: Simplify right side
    1,040.36x = 958,071.02
  5. Step 5: Solve for x
    x = 958,071.02/1,040.36
  6. Step 6: Final answer
    x = 920.91

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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.