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Finding the Fourth Proportional to 391,596.46, 540,384.87 and 221,831.98

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Solution

The fourth proportional to 391,596.46, 540,384.87 and 221,831.98 is: 306,117.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,596.46 : 540,384.87 = 221,831.98 : x
  2. Step 2: Convert to fraction form
    391,596.46/540,384.87 = 221,831.98/x
  3. Step 3: Cross multiply
    391,596.46x = 540,384.87 × 221,831.98
  4. Step 4: Simplify right side
    391,596.46x = 119,874,645,674.14
  5. Step 5: Solve for x
    x = 119,874,645,674.14/391,596.46
  6. Step 6: Final answer
    x = 306,117.80

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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.