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Finding the Fourth Proportional to 1,229.81, 1,697.18 and 670.31

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Solution

The fourth proportional to 1,229.81, 1,697.18 and 670.31 is: 925.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.81 : 1,697.18 = 670.31 : x
  2. Step 2: Convert to fraction form
    1,229.81/1,697.18 = 670.31/x
  3. Step 3: Cross multiply
    1,229.81x = 1,697.18 × 670.31
  4. Step 4: Simplify right side
    1,229.81x = 1,137,628.24
  5. Step 5: Solve for x
    x = 1,137,628.24/1,229.81
  6. Step 6: Final answer
    x = 925.05

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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.