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Finding the Fourth Proportional to 840.08, 1,161.78 and 801.38

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Solution

The fourth proportional to 840.08, 1,161.78 and 801.38 is: 1,108.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.08 : 1,161.78 = 801.38 : x
  2. Step 2: Convert to fraction form
    840.08/1,161.78 = 801.38/x
  3. Step 3: Cross multiply
    840.08x = 1,161.78 × 801.38
  4. Step 4: Simplify right side
    840.08x = 931,027.26
  5. Step 5: Solve for x
    x = 931,027.26/840.08
  6. Step 6: Final answer
    x = 1,108.26

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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.