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Finding the Fourth Proportional to 1,165.34, 1,608.19 and 641.37

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Solution

The fourth proportional to 1,165.34, 1,608.19 and 641.37 is: 885.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.34 : 1,608.19 = 641.37 : x
  2. Step 2: Convert to fraction form
    1,165.34/1,608.19 = 641.37/x
  3. Step 3: Cross multiply
    1,165.34x = 1,608.19 × 641.37
  4. Step 4: Simplify right side
    1,165.34x = 1,031,444.82
  5. Step 5: Solve for x
    x = 1,031,444.82/1,165.34
  6. Step 6: Final answer
    x = 885.10

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Half scale
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Double scale
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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.