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Finding the Fourth Proportional to 309.24, 423.98 and 303.76

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Solution

The fourth proportional to 309.24, 423.98 and 303.76 is: 416.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.24 : 423.98 = 303.76 : x
  2. Step 2: Convert to fraction form
    309.24/423.98 = 303.76/x
  3. Step 3: Cross multiply
    309.24x = 423.98 × 303.76
  4. Step 4: Simplify right side
    309.24x = 128,788.16
  5. Step 5: Solve for x
    x = 128,788.16/309.24
  6. Step 6: Final answer
    x = 416.47

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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.