Home / 1,390.37-2,085.75-416.34

Finding the Fourth Proportional to 1,390.37, 2,085.75 and 416.34

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Solution

The fourth proportional to 1,390.37, 2,085.75 and 416.34 is: 624.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.37 : 2,085.75 = 416.34 : x
  2. Step 2: Convert to fraction form
    1,390.37/2,085.75 = 416.34/x
  3. Step 3: Cross multiply
    1,390.37x = 2,085.75 × 416.34
  4. Step 4: Simplify right side
    1,390.37x = 868,381.16
  5. Step 5: Solve for x
    x = 868,381.16/1,390.37
  6. Step 6: Final answer
    x = 624.57

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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.