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Finding the Fourth Proportional to 690.85, 1,036.01 and 228.49

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Solution

The fourth proportional to 690.85, 1,036.01 and 228.49 is: 342.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.85 : 1,036.01 = 228.49 : x
  2. Step 2: Convert to fraction form
    690.85/1,036.01 = 228.49/x
  3. Step 3: Cross multiply
    690.85x = 1,036.01 × 228.49
  4. Step 4: Simplify right side
    690.85x = 236,717.92
  5. Step 5: Solve for x
    x = 236,717.92/690.85
  6. Step 6: Final answer
    x = 342.65

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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.