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Finding the Fourth Proportional to 1,165.90, 1,608.96 and 641.92

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Solution

The fourth proportional to 1,165.90, 1,608.96 and 641.92 is: 885.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.90 : 1,608.96 = 641.92 : x
  2. Step 2: Convert to fraction form
    1,165.90/1,608.96 = 641.92/x
  3. Step 3: Cross multiply
    1,165.90x = 1,608.96 × 641.92
  4. Step 4: Simplify right side
    1,165.90x = 1,032,823.60
  5. Step 5: Solve for x
    x = 1,032,823.60/1,165.90
  6. Step 6: Final answer
    x = 885.86

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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.