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Finding the Fourth Proportional to 840.17, 1,160.87 and 810.60

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Solution

The fourth proportional to 840.17, 1,160.87 and 810.60 is: 1,120.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.17 : 1,160.87 = 810.60 : x
  2. Step 2: Convert to fraction form
    840.17/1,160.87 = 810.60/x
  3. Step 3: Cross multiply
    840.17x = 1,160.87 × 810.60
  4. Step 4: Simplify right side
    840.17x = 941,001.22
  5. Step 5: Solve for x
    x = 941,001.22/840.17
  6. Step 6: Final answer
    x = 1,120.01

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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.