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Finding the Fourth Proportional to 304.61, 420.95 and 230.80

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Solution

The fourth proportional to 304.61, 420.95 and 230.80 is: 318.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.61 : 420.95 = 230.80 : x
  2. Step 2: Convert to fraction form
    304.61/420.95 = 230.80/x
  3. Step 3: Cross multiply
    304.61x = 420.95 × 230.80
  4. Step 4: Simplify right side
    304.61x = 97,156.36
  5. Step 5: Solve for x
    x = 97,156.36/304.61
  6. Step 6: Final answer
    x = 318.95

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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.