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Finding the Fourth Proportional to 399,656.80, 599,485.20 and 310,427.20

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Solution

The fourth proportional to 399,656.80, 599,485.20 and 310,427.20 is: 465,640.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,656.80 : 599,485.20 = 310,427.20 : x
  2. Step 2: Convert to fraction form
    399,656.80/599,485.20 = 310,427.20/x
  3. Step 3: Cross multiply
    399,656.80x = 599,485.20 × 310,427.20
  4. Step 4: Simplify right side
    399,656.80x = 186,096,512,077.44
  5. Step 5: Solve for x
    x = 186,096,512,077.44/399,656.80
  6. Step 6: Final answer
    x = 465,640.80

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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.