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Finding the Fourth Proportional to 840.67, 1,160.43 and 722.16

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Solution

The fourth proportional to 840.67, 1,160.43 and 722.16 is: 996.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.67 : 1,160.43 = 722.16 : x
  2. Step 2: Convert to fraction form
    840.67/1,160.43 = 722.16/x
  3. Step 3: Cross multiply
    840.67x = 1,160.43 × 722.16
  4. Step 4: Simplify right side
    840.67x = 838,021.36
  5. Step 5: Solve for x
    x = 838,021.36/840.67
  6. Step 6: Final answer
    x = 996.85

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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.