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Finding the Fourth Proportional to 405,087.60, 607,631.40 and 399,182.70

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Solution

The fourth proportional to 405,087.60, 607,631.40 and 399,182.70 is: 598,774.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,087.60 : 607,631.40 = 399,182.70 : x
  2. Step 2: Convert to fraction form
    405,087.60/607,631.40 = 399,182.70/x
  3. Step 3: Cross multiply
    405,087.60x = 607,631.40 × 399,182.70
  4. Step 4: Simplify right side
    405,087.60x = 242,555,942,856.78
  5. Step 5: Solve for x
    x = 242,555,942,856.78/405,087.60
  6. Step 6: Final answer
    x = 598,774.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.