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Finding the Fourth Proportional to 690.09, 1,035.28 and 203.18

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Solution

The fourth proportional to 690.09, 1,035.28 and 203.18 is: 304.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.09 : 1,035.28 = 203.18 : x
  2. Step 2: Convert to fraction form
    690.09/1,035.28 = 203.18/x
  3. Step 3: Cross multiply
    690.09x = 1,035.28 × 203.18
  4. Step 4: Simplify right side
    690.09x = 210,343.27
  5. Step 5: Solve for x
    x = 210,343.27/690.09
  6. Step 6: Final answer
    x = 304.81

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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.