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Finding the Fourth Proportional to 489.15, 733.46 and 431.51

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Solution

The fourth proportional to 489.15, 733.46 and 431.51 is: 647.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.15 : 733.46 = 431.51 : x
  2. Step 2: Convert to fraction form
    489.15/733.46 = 431.51/x
  3. Step 3: Cross multiply
    489.15x = 733.46 × 431.51
  4. Step 4: Simplify right side
    489.15x = 316,489.50
  5. Step 5: Solve for x
    x = 316,489.50/489.15
  6. Step 6: Final answer
    x = 647.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.