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Finding the Fourth Proportional to 309.85, 424.80 and 295.50

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Solution

The fourth proportional to 309.85, 424.80 and 295.50 is: 405.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.85 : 424.80 = 295.50 : x
  2. Step 2: Convert to fraction form
    309.85/424.80 = 295.50/x
  3. Step 3: Cross multiply
    309.85x = 424.80 × 295.50
  4. Step 4: Simplify right side
    309.85x = 125,528.40
  5. Step 5: Solve for x
    x = 125,528.40/309.85
  6. Step 6: Final answer
    x = 405.13

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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.