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Finding the Fourth Proportional to 394,560, 544,494.72 and 215,712

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Solution

The fourth proportional to 394,560, 544,494.72 and 215,712 is: 297,683.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,560 : 544,494.72 = 215,712 : x
  2. Step 2: Convert to fraction form
    394,560/544,494.72 = 215,712/x
  3. Step 3: Cross multiply
    394,560x = 544,494.72 × 215,712
  4. Step 4: Simplify right side
    394,560x = 117,454,045,040.64
  5. Step 5: Solve for x
    x = 117,454,045,040.64/394,560
  6. Step 6: Final answer
    x = 297,683.61

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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.