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Finding the Fourth Proportional to 1,105.68, 1,657.44 and 818.40

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Solution

The fourth proportional to 1,105.68, 1,657.44 and 818.40 is: 1,226.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.68 : 1,657.44 = 818.40 : x
  2. Step 2: Convert to fraction form
    1,105.68/1,657.44 = 818.40/x
  3. Step 3: Cross multiply
    1,105.68x = 1,657.44 × 818.40
  4. Step 4: Simplify right side
    1,105.68x = 1,356,448.90
  5. Step 5: Solve for x
    x = 1,356,448.90/1,105.68
  6. Step 6: Final answer
    x = 1,226.80

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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.