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Finding the Fourth Proportional to 391,319.60, 540,023.04 and 221,586.80

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Solution

The fourth proportional to 391,319.60, 540,023.04 and 221,586.80 is: 305,790.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,319.60 : 540,023.04 = 221,586.80 : x
  2. Step 2: Convert to fraction form
    391,319.60/540,023.04 = 221,586.80/x
  3. Step 3: Cross multiply
    391,319.60x = 540,023.04 × 221,586.80
  4. Step 4: Simplify right side
    391,319.60x = 119,661,977,359.87
  5. Step 5: Solve for x
    x = 119,661,977,359.87/391,319.60
  6. Step 6: Final answer
    x = 305,790.91

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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.