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Finding the Fourth Proportional to 356.91, 492.21 and 278.13

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Solution

The fourth proportional to 356.91, 492.21 and 278.13 is: 383.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.91 : 492.21 = 278.13 : x
  2. Step 2: Convert to fraction form
    356.91/492.21 = 278.13/x
  3. Step 3: Cross multiply
    356.91x = 492.21 × 278.13
  4. Step 4: Simplify right side
    356.91x = 136,898.37
  5. Step 5: Solve for x
    x = 136,898.37/356.91
  6. Step 6: Final answer
    x = 383.57

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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.