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Finding the Fourth Proportional to 835.16, 1,253.30 and 315.64

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Solution

The fourth proportional to 835.16, 1,253.30 and 315.64 is: 473.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.16 : 1,253.30 = 315.64 : x
  2. Step 2: Convert to fraction form
    835.16/1,253.30 = 315.64/x
  3. Step 3: Cross multiply
    835.16x = 1,253.30 × 315.64
  4. Step 4: Simplify right side
    835.16x = 395,591.61
  5. Step 5: Solve for x
    x = 395,591.61/835.16
  6. Step 6: Final answer
    x = 473.67

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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.