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Finding the Fourth Proportional to 1,003.90, 1,506.33 and 419.35

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Solution

The fourth proportional to 1,003.90, 1,506.33 and 419.35 is: 629.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.90 : 1,506.33 = 419.35 : x
  2. Step 2: Convert to fraction form
    1,003.90/1,506.33 = 419.35/x
  3. Step 3: Cross multiply
    1,003.90x = 1,506.33 × 419.35
  4. Step 4: Simplify right side
    1,003.90x = 631,679.49
  5. Step 5: Solve for x
    x = 631,679.49/1,003.90
  6. Step 6: Final answer
    x = 629.23

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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.