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Finding the Fourth Proportional to 835.36, 1,252.80 and 287.40

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Solution

The fourth proportional to 835.36, 1,252.80 and 287.40 is: 431.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.36 : 1,252.80 = 287.40 : x
  2. Step 2: Convert to fraction form
    835.36/1,252.80 = 287.40/x
  3. Step 3: Cross multiply
    835.36x = 1,252.80 × 287.40
  4. Step 4: Simplify right side
    835.36x = 360,054.72
  5. Step 5: Solve for x
    x = 360,054.72/835.36
  6. Step 6: Final answer
    x = 431.02

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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.