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Finding the Fourth Proportional to 1,118.16, 1,678.68 and 813.60

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Solution

The fourth proportional to 1,118.16, 1,678.68 and 813.60 is: 1,221.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.16 : 1,678.68 = 813.60 : x
  2. Step 2: Convert to fraction form
    1,118.16/1,678.68 = 813.60/x
  3. Step 3: Cross multiply
    1,118.16x = 1,678.68 × 813.60
  4. Step 4: Simplify right side
    1,118.16x = 1,365,774.05
  5. Step 5: Solve for x
    x = 1,365,774.05/1,118.16
  6. Step 6: Final answer
    x = 1,221.45

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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.