Home / 1,390.14-2,084.70-415.91

Finding the Fourth Proportional to 1,390.14, 2,084.70 and 415.91

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Solution

The fourth proportional to 1,390.14, 2,084.70 and 415.91 is: 623.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.14 : 2,084.70 = 415.91 : x
  2. Step 2: Convert to fraction form
    1,390.14/2,084.70 = 415.91/x
  3. Step 3: Cross multiply
    1,390.14x = 2,084.70 × 415.91
  4. Step 4: Simplify right side
    1,390.14x = 867,047.58
  5. Step 5: Solve for x
    x = 867,047.58/1,390.14
  6. Step 6: Final answer
    x = 623.71

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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.