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Finding the Fourth Proportional to 216,521.84, 324,761.87 and 66,721.89

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Solution

The fourth proportional to 216,521.84, 324,761.87 and 66,721.89 is: 100,076.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,521.84 : 324,761.87 = 66,721.89 : x
  2. Step 2: Convert to fraction form
    216,521.84/324,761.87 = 66,721.89/x
  3. Step 3: Cross multiply
    216,521.84x = 324,761.87 × 66,721.89
  4. Step 4: Simplify right side
    216,521.84x = 21,668,725,432.72
  5. Step 5: Solve for x
    x = 21,668,725,432.72/216,521.84
  6. Step 6: Final answer
    x = 100,076.40

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1.5x scale

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.