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Finding the Fourth Proportional to 1,068.90, 1,603.50 and 419.56

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Solution

The fourth proportional to 1,068.90, 1,603.50 and 419.56 is: 629.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.90 : 1,603.50 = 419.56 : x
  2. Step 2: Convert to fraction form
    1,068.90/1,603.50 = 419.56/x
  3. Step 3: Cross multiply
    1,068.90x = 1,603.50 × 419.56
  4. Step 4: Simplify right side
    1,068.90x = 672,764.46
  5. Step 5: Solve for x
    x = 672,764.46/1,068.90
  6. Step 6: Final answer
    x = 629.40

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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.