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Finding the Fourth Proportional to 690.60, 1,035.95 and 300.61

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Solution

The fourth proportional to 690.60, 1,035.95 and 300.61 is: 450.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.60 : 1,035.95 = 300.61 : x
  2. Step 2: Convert to fraction form
    690.60/1,035.95 = 300.61/x
  3. Step 3: Cross multiply
    690.60x = 1,035.95 × 300.61
  4. Step 4: Simplify right side
    690.60x = 311,416.47
  5. Step 5: Solve for x
    x = 311,416.47/690.60
  6. Step 6: Final answer
    x = 450.94

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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.