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Finding the Fourth Proportional to 1,040.84, 1,435.79 and 667.40

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Solution

The fourth proportional to 1,040.84, 1,435.79 and 667.40 is: 920.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.84 : 1,435.79 = 667.40 : x
  2. Step 2: Convert to fraction form
    1,040.84/1,435.79 = 667.40/x
  3. Step 3: Cross multiply
    1,040.84x = 1,435.79 × 667.40
  4. Step 4: Simplify right side
    1,040.84x = 958,248.02
  5. Step 5: Solve for x
    x = 958,248.02/1,040.84
  6. Step 6: Final answer
    x = 920.65

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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.