Home / 1,313.79-1,979.72-1,087.76

Finding the Fourth Proportional to 1,313.79, 1,979.72 and 1,087.76

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Solution

The fourth proportional to 1,313.79, 1,979.72 and 1,087.76 is: 1,639.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.79 : 1,979.72 = 1,087.76 : x
  2. Step 2: Convert to fraction form
    1,313.79/1,979.72 = 1,087.76/x
  3. Step 3: Cross multiply
    1,313.79x = 1,979.72 × 1,087.76
  4. Step 4: Simplify right side
    1,313.79x = 2,153,463.82
  5. Step 5: Solve for x
    x = 2,153,463.82/1,313.79
  6. Step 6: Final answer
    x = 1,639.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.