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Finding the Fourth Proportional to 694.81, 1,041.40 and 309.25

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Solution

The fourth proportional to 694.81, 1,041.40 and 309.25 is: 463.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.81 : 1,041.40 = 309.25 : x
  2. Step 2: Convert to fraction form
    694.81/1,041.40 = 309.25/x
  3. Step 3: Cross multiply
    694.81x = 1,041.40 × 309.25
  4. Step 4: Simplify right side
    694.81x = 322,052.95
  5. Step 5: Solve for x
    x = 322,052.95/694.81
  6. Step 6: Final answer
    x = 463.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.