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Finding the Fourth Proportional to 391,321.10, 540,025.11 and 221,588.30

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Solution

The fourth proportional to 391,321.10, 540,025.11 and 221,588.30 is: 305,792.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,321.10 : 540,025.11 = 221,588.30 : x
  2. Step 2: Convert to fraction form
    391,321.10/540,025.11 = 221,588.30/x
  3. Step 3: Cross multiply
    391,321.10x = 540,025.11 × 221,588.30
  4. Step 4: Simplify right side
    391,321.10x = 119,663,246,082.21
  5. Step 5: Solve for x
    x = 119,663,246,082.21/391,321.10
  6. Step 6: Final answer
    x = 305,792.98

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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.