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Finding the Fourth Proportional to 313.77, 430.49 and 298.28

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Solution

The fourth proportional to 313.77, 430.49 and 298.28 is: 409.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.77 : 430.49 = 298.28 : x
  2. Step 2: Convert to fraction form
    313.77/430.49 = 298.28/x
  3. Step 3: Cross multiply
    313.77x = 430.49 × 298.28
  4. Step 4: Simplify right side
    313.77x = 128,407.54
  5. Step 5: Solve for x
    x = 128,407.54/313.77
  6. Step 6: Final answer
    x = 409.24

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.