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Finding the Fourth Proportional to 1,486.13, 2,229.03 and 390.62

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Solution

The fourth proportional to 1,486.13, 2,229.03 and 390.62 is: 585.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.13 : 2,229.03 = 390.62 : x
  2. Step 2: Convert to fraction form
    1,486.13/2,229.03 = 390.62/x
  3. Step 3: Cross multiply
    1,486.13x = 2,229.03 × 390.62
  4. Step 4: Simplify right side
    1,486.13x = 870,703.70
  5. Step 5: Solve for x
    x = 870,703.70/1,486.13
  6. Step 6: Final answer
    x = 585.89

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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.