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Finding the Fourth Proportional to 357.45, 493.47 and 278.60

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Solution

The fourth proportional to 357.45, 493.47 and 278.60 is: 384.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.45 : 493.47 = 278.60 : x
  2. Step 2: Convert to fraction form
    357.45/493.47 = 278.60/x
  3. Step 3: Cross multiply
    357.45x = 493.47 × 278.60
  4. Step 4: Simplify right side
    357.45x = 137,480.74
  5. Step 5: Solve for x
    x = 137,480.74/357.45
  6. Step 6: Final answer
    x = 384.62

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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.