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Finding the Fourth Proportional to 690.52, 1,035.78 and 300.51

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Solution

The fourth proportional to 690.52, 1,035.78 and 300.51 is: 450.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.52 : 1,035.78 = 300.51 : x
  2. Step 2: Convert to fraction form
    690.52/1,035.78 = 300.51/x
  3. Step 3: Cross multiply
    690.52x = 1,035.78 × 300.51
  4. Step 4: Simplify right side
    690.52x = 311,262.25
  5. Step 5: Solve for x
    x = 311,262.25/690.52
  6. Step 6: Final answer
    x = 450.77

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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.