Home / 1,390.04-2,081.46-812.60

Finding the Fourth Proportional to 1,390.04, 2,081.46 and 812.60

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Solution

The fourth proportional to 1,390.04, 2,081.46 and 812.60 is: 1,216.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.04 : 2,081.46 = 812.60 : x
  2. Step 2: Convert to fraction form
    1,390.04/2,081.46 = 812.60/x
  3. Step 3: Cross multiply
    1,390.04x = 2,081.46 × 812.60
  4. Step 4: Simplify right side
    1,390.04x = 1,691,394.40
  5. Step 5: Solve for x
    x = 1,691,394.40/1,390.04
  6. Step 6: Final answer
    x = 1,216.80

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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.