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Finding the Fourth Proportional to 305.13, 457.80 and 189.39

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Solution

The fourth proportional to 305.13, 457.80 and 189.39 is: 284.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.13 : 457.80 = 189.39 : x
  2. Step 2: Convert to fraction form
    305.13/457.80 = 189.39/x
  3. Step 3: Cross multiply
    305.13x = 457.80 × 189.39
  4. Step 4: Simplify right side
    305.13x = 86,702.74
  5. Step 5: Solve for x
    x = 86,702.74/305.13
  6. Step 6: Final answer
    x = 284.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.