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Finding the Fourth Proportional to 357.40, 491.61 and 301.78

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Solution

The fourth proportional to 357.40, 491.61 and 301.78 is: 415.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.40 : 491.61 = 301.78 : x
  2. Step 2: Convert to fraction form
    357.40/491.61 = 301.78/x
  3. Step 3: Cross multiply
    357.40x = 491.61 × 301.78
  4. Step 4: Simplify right side
    357.40x = 148,358.07
  5. Step 5: Solve for x
    x = 148,358.07/357.40
  6. Step 6: Final answer
    x = 415.10

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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.