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Finding the Fourth Proportional to 690.13, 1,035.18 and 203.19

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Solution

The fourth proportional to 690.13, 1,035.18 and 203.19 is: 304.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.13 : 1,035.18 = 203.19 : x
  2. Step 2: Convert to fraction form
    690.13/1,035.18 = 203.19/x
  3. Step 3: Cross multiply
    690.13x = 1,035.18 × 203.19
  4. Step 4: Simplify right side
    690.13x = 210,338.22
  5. Step 5: Solve for x
    x = 210,338.22/690.13
  6. Step 6: Final answer
    x = 304.78

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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.