Home / 2,313.30-3,190.68-1,428.78

Finding the Fourth Proportional to 2,313.30, 3,190.68 and 1,428.78

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Solution

The fourth proportional to 2,313.30, 3,190.68 and 1,428.78 is: 1,970.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,313.30 : 3,190.68 = 1,428.78 : x
  2. Step 2: Convert to fraction form
    2,313.30/3,190.68 = 1,428.78/x
  3. Step 3: Cross multiply
    2,313.30x = 3,190.68 × 1,428.78
  4. Step 4: Simplify right side
    2,313.30x = 4,558,779.77
  5. Step 5: Solve for x
    x = 4,558,779.77/2,313.30
  6. Step 6: Final answer
    x = 1,970.68

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1.5x scale

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.