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Finding the Fourth Proportional to 298.68, 412.50 and 287.88

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Solution

The fourth proportional to 298.68, 412.50 and 287.88 is: 397.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.68 : 412.50 = 287.88 : x
  2. Step 2: Convert to fraction form
    298.68/412.50 = 287.88/x
  3. Step 3: Cross multiply
    298.68x = 412.50 × 287.88
  4. Step 4: Simplify right side
    298.68x = 118,750.50
  5. Step 5: Solve for x
    x = 118,750.50/298.68
  6. Step 6: Final answer
    x = 397.58

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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.