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Finding the Fourth Proportional to 903.15, 1,352.90 and 721.51

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Solution

The fourth proportional to 903.15, 1,352.90 and 721.51 is: 1,080.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.15 : 1,352.90 = 721.51 : x
  2. Step 2: Convert to fraction form
    903.15/1,352.90 = 721.51/x
  3. Step 3: Cross multiply
    903.15x = 1,352.90 × 721.51
  4. Step 4: Simplify right side
    903.15x = 976,129.30
  5. Step 5: Solve for x
    x = 976,129.30/903.15
  6. Step 6: Final answer
    x = 1,080.81

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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.