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Finding the Fourth Proportional to 1,331.10, 1,992.06 and 917.46

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Solution

The fourth proportional to 1,331.10, 1,992.06 and 917.46 is: 1,373.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.10 : 1,992.06 = 917.46 : x
  2. Step 2: Convert to fraction form
    1,331.10/1,992.06 = 917.46/x
  3. Step 3: Cross multiply
    1,331.10x = 1,992.06 × 917.46
  4. Step 4: Simplify right side
    1,331.10x = 1,827,635.37
  5. Step 5: Solve for x
    x = 1,827,635.37/1,331.10
  6. Step 6: Final answer
    x = 1,373.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.