Home / 1,390.32-2,085.36-416.40

Finding the Fourth Proportional to 1,390.32, 2,085.36 and 416.40

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Solution

The fourth proportional to 1,390.32, 2,085.36 and 416.40 is: 624.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.32 : 2,085.36 = 416.40 : x
  2. Step 2: Convert to fraction form
    1,390.32/2,085.36 = 416.40/x
  3. Step 3: Cross multiply
    1,390.32x = 2,085.36 × 416.40
  4. Step 4: Simplify right side
    1,390.32x = 868,343.90
  5. Step 5: Solve for x
    x = 868,343.90/1,390.32
  6. Step 6: Final answer
    x = 624.56

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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.