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Finding the Fourth Proportional to 455,090.40, 681,080.40 and 399,103.20

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Solution

The fourth proportional to 455,090.40, 681,080.40 and 399,103.20 is: 597,290.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,090.40 : 681,080.40 = 399,103.20 : x
  2. Step 2: Convert to fraction form
    455,090.40/681,080.40 = 399,103.20/x
  3. Step 3: Cross multiply
    455,090.40x = 681,080.40 × 399,103.20
  4. Step 4: Simplify right side
    455,090.40x = 271,821,367,097.28
  5. Step 5: Solve for x
    x = 271,821,367,097.28/455,090.40
  6. Step 6: Final answer
    x = 597,290.93

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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.