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Finding the Fourth Proportional to 690.45, 1,034.46 and 447.06

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Solution

The fourth proportional to 690.45, 1,034.46 and 447.06 is: 669.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.45 : 1,034.46 = 447.06 : x
  2. Step 2: Convert to fraction form
    690.45/1,034.46 = 447.06/x
  3. Step 3: Cross multiply
    690.45x = 1,034.46 × 447.06
  4. Step 4: Simplify right side
    690.45x = 462,465.69
  5. Step 5: Solve for x
    x = 462,465.69/690.45
  6. Step 6: Final answer
    x = 669.80

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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.