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Finding the Fourth Proportional to 1,390.56, 2,085.58 and 416.46

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Solution

The fourth proportional to 1,390.56, 2,085.58 and 416.46 is: 624.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.56 : 2,085.58 = 416.46 : x
  2. Step 2: Convert to fraction form
    1,390.56/2,085.58 = 416.46/x
  3. Step 3: Cross multiply
    1,390.56x = 2,085.58 × 416.46
  4. Step 4: Simplify right side
    1,390.56x = 868,560.65
  5. Step 5: Solve for x
    x = 868,560.65/1,390.56
  6. Step 6: Final answer
    x = 624.61

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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.