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Finding the Fourth Proportional to 401.86, 554.95 and 386.83

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Solution

The fourth proportional to 401.86, 554.95 and 386.83 is: 534.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.86 : 554.95 = 386.83 : x
  2. Step 2: Convert to fraction form
    401.86/554.95 = 386.83/x
  3. Step 3: Cross multiply
    401.86x = 554.95 × 386.83
  4. Step 4: Simplify right side
    401.86x = 214,669.36
  5. Step 5: Solve for x
    x = 214,669.36/401.86
  6. Step 6: Final answer
    x = 534.19

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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.