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Finding the Fourth Proportional to 746.09, 1,118.79 and 399.35

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Solution

The fourth proportional to 746.09, 1,118.79 and 399.35 is: 598.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.09 : 1,118.79 = 399.35 : x
  2. Step 2: Convert to fraction form
    746.09/1,118.79 = 399.35/x
  3. Step 3: Cross multiply
    746.09x = 1,118.79 × 399.35
  4. Step 4: Simplify right side
    746.09x = 446,788.79
  5. Step 5: Solve for x
    x = 446,788.79/746.09
  6. Step 6: Final answer
    x = 598.84

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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.