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Finding the Fourth Proportional to 391,688, 540,529.98 and 221,933.60

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Solution

The fourth proportional to 391,688, 540,529.98 and 221,933.60 is: 306,268.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,688 : 540,529.98 = 221,933.60 : x
  2. Step 2: Convert to fraction form
    391,688/540,529.98 = 221,933.60/x
  3. Step 3: Cross multiply
    391,688x = 540,529.98 × 221,933.60
  4. Step 4: Simplify right side
    391,688x = 119,961,764,369.33
  5. Step 5: Solve for x
    x = 119,961,764,369.33/391,688
  6. Step 6: Final answer
    x = 306,268.67

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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.