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Finding the Fourth Proportional to 405,870.40, 608,805.60 and 219,246.40

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Solution

The fourth proportional to 405,870.40, 608,805.60 and 219,246.40 is: 328,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,870.40 : 608,805.60 = 219,246.40 : x
  2. Step 2: Convert to fraction form
    405,870.40/608,805.60 = 219,246.40/x
  3. Step 3: Cross multiply
    405,870.40x = 608,805.60 × 219,246.40
  4. Step 4: Simplify right side
    405,870.40x = 133,478,436,099.84
  5. Step 5: Solve for x
    x = 133,478,436,099.84/405,870.40
  6. Step 6: Final answer
    x = 328,869.60

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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.