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Finding the Fourth Proportional to 689.38, 1,032.48 and 445.18

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Solution

The fourth proportional to 689.38, 1,032.48 and 445.18 is: 666.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.38 : 1,032.48 = 445.18 : x
  2. Step 2: Convert to fraction form
    689.38/1,032.48 = 445.18/x
  3. Step 3: Cross multiply
    689.38x = 1,032.48 × 445.18
  4. Step 4: Simplify right side
    689.38x = 459,639.45
  5. Step 5: Solve for x
    x = 459,639.45/689.38
  6. Step 6: Final answer
    x = 666.74

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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.