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Finding the Fourth Proportional to 690.95, 1,036.76 and 325.77

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Solution

The fourth proportional to 690.95, 1,036.76 and 325.77 is: 488.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.95 : 1,036.76 = 325.77 : x
  2. Step 2: Convert to fraction form
    690.95/1,036.76 = 325.77/x
  3. Step 3: Cross multiply
    690.95x = 1,036.76 × 325.77
  4. Step 4: Simplify right side
    690.95x = 337,743.68
  5. Step 5: Solve for x
    x = 337,743.68/690.95
  6. Step 6: Final answer
    x = 488.81

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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.