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Finding the Fourth Proportional to 1,166.38, 1,609.54 and 642.31

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Solution

The fourth proportional to 1,166.38, 1,609.54 and 642.31 is: 886.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,166.38 : 1,609.54 = 642.31 : x
  2. Step 2: Convert to fraction form
    1,166.38/1,609.54 = 642.31/x
  3. Step 3: Cross multiply
    1,166.38x = 1,609.54 × 642.31
  4. Step 4: Simplify right side
    1,166.38x = 1,033,823.64
  5. Step 5: Solve for x
    x = 1,033,823.64/1,166.38
  6. Step 6: Final answer
    x = 886.35

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1.5x scale

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.