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Finding the Fourth Proportional to 354.31, 489.51 and 302.40

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Solution

The fourth proportional to 354.31, 489.51 and 302.40 is: 417.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.31 : 489.51 = 302.40 : x
  2. Step 2: Convert to fraction form
    354.31/489.51 = 302.40/x
  3. Step 3: Cross multiply
    354.31x = 489.51 × 302.40
  4. Step 4: Simplify right side
    354.31x = 148,027.82
  5. Step 5: Solve for x
    x = 148,027.82/354.31
  6. Step 6: Final answer
    x = 417.79

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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.