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Finding the Fourth Proportional to 690.13, 1,035.71 and 382.25

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Solution

The fourth proportional to 690.13, 1,035.71 and 382.25 is: 573.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.13 : 1,035.71 = 382.25 : x
  2. Step 2: Convert to fraction form
    690.13/1,035.71 = 382.25/x
  3. Step 3: Cross multiply
    690.13x = 1,035.71 × 382.25
  4. Step 4: Simplify right side
    690.13x = 395,900.15
  5. Step 5: Solve for x
    x = 395,900.15/690.13
  6. Step 6: Final answer
    x = 573.66

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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.