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Finding the Fourth Proportional to 356.70, 492.30 and 258.42

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Solution

The fourth proportional to 356.70, 492.30 and 258.42 is: 356.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.70 : 492.30 = 258.42 : x
  2. Step 2: Convert to fraction form
    356.70/492.30 = 258.42/x
  3. Step 3: Cross multiply
    356.70x = 492.30 × 258.42
  4. Step 4: Simplify right side
    356.70x = 127,220.17
  5. Step 5: Solve for x
    x = 127,220.17/356.70
  6. Step 6: Final answer
    x = 356.66

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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.