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Finding the Fourth Proportional to 401.85, 554.31 and 302.40

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Solution

The fourth proportional to 401.85, 554.31 and 302.40 is: 417.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.85 : 554.31 = 302.40 : x
  2. Step 2: Convert to fraction form
    401.85/554.31 = 302.40/x
  3. Step 3: Cross multiply
    401.85x = 554.31 × 302.40
  4. Step 4: Simplify right side
    401.85x = 167,623.34
  5. Step 5: Solve for x
    x = 167,623.34/401.85
  6. Step 6: Final answer
    x = 417.13

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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.