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Finding the Fourth Proportional to 835.20, 1,152.58 and 485.90

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Solution

The fourth proportional to 835.20, 1,152.58 and 485.90 is: 670.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.20 : 1,152.58 = 485.90 : x
  2. Step 2: Convert to fraction form
    835.20/1,152.58 = 485.90/x
  3. Step 3: Cross multiply
    835.20x = 1,152.58 × 485.90
  4. Step 4: Simplify right side
    835.20x = 560,038.62
  5. Step 5: Solve for x
    x = 560,038.62/835.20
  6. Step 6: Final answer
    x = 670.54

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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.