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Finding the Fourth Proportional to 391,673, 540,509.28 and 221,918.60

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Solution

The fourth proportional to 391,673, 540,509.28 and 221,918.60 is: 306,247.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,673 : 540,509.28 = 221,918.60 : x
  2. Step 2: Convert to fraction form
    391,673/540,509.28 = 221,918.60/x
  3. Step 3: Cross multiply
    391,673x = 540,509.28 × 221,918.60
  4. Step 4: Simplify right side
    391,673x = 119,949,062,704.61
  5. Step 5: Solve for x
    x = 119,949,062,704.61/391,673
  6. Step 6: Final answer
    x = 306,247.97

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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.