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Finding the Fourth Proportional to 690.26, 1,035.38 and 203.45

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Solution

The fourth proportional to 690.26, 1,035.38 and 203.45 is: 305.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.26 : 1,035.38 = 203.45 : x
  2. Step 2: Convert to fraction form
    690.26/1,035.38 = 203.45/x
  3. Step 3: Cross multiply
    690.26x = 1,035.38 × 203.45
  4. Step 4: Simplify right side
    690.26x = 210,643.39
  5. Step 5: Solve for x
    x = 210,643.39/690.26
  6. Step 6: Final answer
    x = 305.17

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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.