Home / 1,313.30-1,812.13-789.35

Finding the Fourth Proportional to 1,313.30, 1,812.13 and 789.35

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Solution

The fourth proportional to 1,313.30, 1,812.13 and 789.35 is: 1,089.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.30 : 1,812.13 = 789.35 : x
  2. Step 2: Convert to fraction form
    1,313.30/1,812.13 = 789.35/x
  3. Step 3: Cross multiply
    1,313.30x = 1,812.13 × 789.35
  4. Step 4: Simplify right side
    1,313.30x = 1,430,404.82
  5. Step 5: Solve for x
    x = 1,430,404.82/1,313.30
  6. Step 6: Final answer
    x = 1,089.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.