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Finding the Fourth Proportional to 357.02, 491.94 and 317.78

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Solution

The fourth proportional to 357.02, 491.94 and 317.78 is: 437.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.02 : 491.94 = 317.78 : x
  2. Step 2: Convert to fraction form
    357.02/491.94 = 317.78/x
  3. Step 3: Cross multiply
    357.02x = 491.94 × 317.78
  4. Step 4: Simplify right side
    357.02x = 156,328.69
  5. Step 5: Solve for x
    x = 156,328.69/357.02
  6. Step 6: Final answer
    x = 437.87

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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.