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Finding the Fourth Proportional to 391,638, 540,460.98 and 221,883.60

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Solution

The fourth proportional to 391,638, 540,460.98 and 221,883.60 is: 306,199.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,638 : 540,460.98 = 221,883.60 : x
  2. Step 2: Convert to fraction form
    391,638/540,460.98 = 221,883.60/x
  3. Step 3: Cross multiply
    391,638x = 540,460.98 × 221,883.60
  4. Step 4: Simplify right side
    391,638x = 119,919,427,901.93
  5. Step 5: Solve for x
    x = 119,919,427,901.93/391,638
  6. Step 6: Final answer
    x = 306,199.67

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1.5x scale

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.