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Finding the Fourth Proportional to 1,207.95, 1,667 and 676.81

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Solution

The fourth proportional to 1,207.95, 1,667 and 676.81 is: 934.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.95 : 1,667 = 676.81 : x
  2. Step 2: Convert to fraction form
    1,207.95/1,667 = 676.81/x
  3. Step 3: Cross multiply
    1,207.95x = 1,667 × 676.81
  4. Step 4: Simplify right side
    1,207.95x = 1,128,242.27
  5. Step 5: Solve for x
    x = 1,128,242.27/1,207.95
  6. Step 6: Final answer
    x = 934.01

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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.