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Finding the Fourth Proportional to 1,764.42, 2,435 and 978.54

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Solution

The fourth proportional to 1,764.42, 2,435 and 978.54 is: 1,350.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,764.42 : 2,435 = 978.54 : x
  2. Step 2: Convert to fraction form
    1,764.42/2,435 = 978.54/x
  3. Step 3: Cross multiply
    1,764.42x = 2,435 × 978.54
  4. Step 4: Simplify right side
    1,764.42x = 2,382,744.90
  5. Step 5: Solve for x
    x = 2,382,744.90/1,764.42
  6. Step 6: Final answer
    x = 1,350.44

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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.