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Finding the Fourth Proportional to 356.93, 492.20 and 257.30

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Solution

The fourth proportional to 356.93, 492.20 and 257.30 is: 354.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.93 : 492.20 = 257.30 : x
  2. Step 2: Convert to fraction form
    356.93/492.20 = 257.30/x
  3. Step 3: Cross multiply
    356.93x = 492.20 × 257.30
  4. Step 4: Simplify right side
    356.93x = 126,639.31
  5. Step 5: Solve for x
    x = 126,639.31/356.93
  6. Step 6: Final answer
    x = 354.81

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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.