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Finding the Fourth Proportional to 690.55, 1,035.85 and 203.60

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Solution

The fourth proportional to 690.55, 1,035.85 and 203.60 is: 305.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.55 : 1,035.85 = 203.60 : x
  2. Step 2: Convert to fraction form
    690.55/1,035.85 = 203.60/x
  3. Step 3: Cross multiply
    690.55x = 1,035.85 × 203.60
  4. Step 4: Simplify right side
    690.55x = 210,899.06
  5. Step 5: Solve for x
    x = 210,899.06/690.55
  6. Step 6: Final answer
    x = 305.41

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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.