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Finding the Fourth Proportional to 324.81, 488.15 and 312.69

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Solution

The fourth proportional to 324.81, 488.15 and 312.69 is: 469.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.81 : 488.15 = 312.69 : x
  2. Step 2: Convert to fraction form
    324.81/488.15 = 312.69/x
  3. Step 3: Cross multiply
    324.81x = 488.15 × 312.69
  4. Step 4: Simplify right side
    324.81x = 152,638.06
  5. Step 5: Solve for x
    x = 152,638.06/324.81
  6. Step 6: Final answer
    x = 469.93

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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.