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Finding the Fourth Proportional to 1,489.63, 2,234.28 and 394.12

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Solution

The fourth proportional to 1,489.63, 2,234.28 and 394.12 is: 591.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.63 : 2,234.28 = 394.12 : x
  2. Step 2: Convert to fraction form
    1,489.63/2,234.28 = 394.12/x
  3. Step 3: Cross multiply
    1,489.63x = 2,234.28 × 394.12
  4. Step 4: Simplify right side
    1,489.63x = 880,574.43
  5. Step 5: Solve for x
    x = 880,574.43/1,489.63
  6. Step 6: Final answer
    x = 591.14

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1.5x scale

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.