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Finding the Fourth Proportional to 405,528.60, 608,907.30 and 312,139.80

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Solution

The fourth proportional to 405,528.60, 608,907.30 and 312,139.80 is: 468,682.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,528.60 : 608,907.30 = 312,139.80 : x
  2. Step 2: Convert to fraction form
    405,528.60/608,907.30 = 312,139.80/x
  3. Step 3: Cross multiply
    405,528.60x = 608,907.30 × 312,139.80
  4. Step 4: Simplify right side
    405,528.60x = 190,064,202,840.54
  5. Step 5: Solve for x
    x = 190,064,202,840.54/405,528.60
  6. Step 6: Final answer
    x = 468,682.61

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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.