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Finding the Fourth Proportional to 835.70, 1,253.80 and 488.40

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Solution

The fourth proportional to 835.70, 1,253.80 and 488.40 is: 732.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.70 : 1,253.80 = 488.40 : x
  2. Step 2: Convert to fraction form
    835.70/1,253.80 = 488.40/x
  3. Step 3: Cross multiply
    835.70x = 1,253.80 × 488.40
  4. Step 4: Simplify right side
    835.70x = 612,355.92
  5. Step 5: Solve for x
    x = 612,355.92/835.70
  6. Step 6: Final answer
    x = 732.75

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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.