Home / 1,390.04-2,085.21-416.15

Finding the Fourth Proportional to 1,390.04, 2,085.21 and 416.15

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Solution

The fourth proportional to 1,390.04, 2,085.21 and 416.15 is: 624.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.04 : 2,085.21 = 416.15 : x
  2. Step 2: Convert to fraction form
    1,390.04/2,085.21 = 416.15/x
  3. Step 3: Cross multiply
    1,390.04x = 2,085.21 × 416.15
  4. Step 4: Simplify right side
    1,390.04x = 867,749.72
  5. Step 5: Solve for x
    x = 867,749.72/1,390.04
  6. Step 6: Final answer
    x = 624.26

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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.