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Finding the Fourth Proportional to 1,393, 2,089.71 and 419.08

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Solution

The fourth proportional to 1,393, 2,089.71 and 419.08 is: 628.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393 : 2,089.71 = 419.08 : x
  2. Step 2: Convert to fraction form
    1,393/2,089.71 = 419.08/x
  3. Step 3: Cross multiply
    1,393x = 2,089.71 × 419.08
  4. Step 4: Simplify right side
    1,393x = 875,755.67
  5. Step 5: Solve for x
    x = 875,755.67/1,393
  6. Step 6: Final answer
    x = 628.68

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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.