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Finding the Fourth Proportional to 690.54, 1,035.45 and 203.53

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Solution

The fourth proportional to 690.54, 1,035.45 and 203.53 is: 305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.54 : 1,035.45 = 203.53 : x
  2. Step 2: Convert to fraction form
    690.54/1,035.45 = 203.53/x
  3. Step 3: Cross multiply
    690.54x = 1,035.45 × 203.53
  4. Step 4: Simplify right side
    690.54x = 210,739.96
  5. Step 5: Solve for x
    x = 210,739.96/690.54
  6. Step 6: Final answer
    x = 305.18

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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.