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Finding the Fourth Proportional to 604,978.40, 907,467.60 and 405,912.80

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Solution

The fourth proportional to 604,978.40, 907,467.60 and 405,912.80 is: 608,869.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    604,978.40 : 907,467.60 = 405,912.80 : x
  2. Step 2: Convert to fraction form
    604,978.40/907,467.60 = 405,912.80/x
  3. Step 3: Cross multiply
    604,978.40x = 907,467.60 × 405,912.80
  4. Step 4: Simplify right side
    604,978.40x = 368,352,714,425.28
  5. Step 5: Solve for x
    x = 368,352,714,425.28/604,978.40
  6. Step 6: Final answer
    x = 608,869.20

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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.