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Finding the Fourth Proportional to 357.10, 491.78 and 258.70

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Solution

The fourth proportional to 357.10, 491.78 and 258.70 is: 356.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.10 : 491.78 = 258.70 : x
  2. Step 2: Convert to fraction form
    357.10/491.78 = 258.70/x
  3. Step 3: Cross multiply
    357.10x = 491.78 × 258.70
  4. Step 4: Simplify right side
    357.10x = 127,223.49
  5. Step 5: Solve for x
    x = 127,223.49/357.10
  6. Step 6: Final answer
    x = 356.27

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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.