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Finding the Fourth Proportional to 401.87, 554.61 and 389.12

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Solution

The fourth proportional to 401.87, 554.61 and 389.12 is: 537.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.87 : 554.61 = 389.12 : x
  2. Step 2: Convert to fraction form
    401.87/554.61 = 389.12/x
  3. Step 3: Cross multiply
    401.87x = 554.61 × 389.12
  4. Step 4: Simplify right side
    401.87x = 215,808.53
  5. Step 5: Solve for x
    x = 215,808.53/401.87
  6. Step 6: Final answer
    x = 537.01

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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.