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Finding the Fourth Proportional to 374.68, 515.46 and 287.20

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Solution

The fourth proportional to 374.68, 515.46 and 287.20 is: 395.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.68 : 515.46 = 287.20 : x
  2. Step 2: Convert to fraction form
    374.68/515.46 = 287.20/x
  3. Step 3: Cross multiply
    374.68x = 515.46 × 287.20
  4. Step 4: Simplify right side
    374.68x = 148,040.11
  5. Step 5: Solve for x
    x = 148,040.11/374.68
  6. Step 6: Final answer
    x = 395.11

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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.