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Finding the Fourth Proportional to 1,486, 2,229.03 and 390.46

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Solution

The fourth proportional to 1,486, 2,229.03 and 390.46 is: 585.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486 : 2,229.03 = 390.46 : x
  2. Step 2: Convert to fraction form
    1,486/2,229.03 = 390.46/x
  3. Step 3: Cross multiply
    1,486x = 2,229.03 × 390.46
  4. Step 4: Simplify right side
    1,486x = 870,347.05
  5. Step 5: Solve for x
    x = 870,347.05/1,486
  6. Step 6: Final answer
    x = 585.70

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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.