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Finding the Fourth Proportional to 340,408.40, 510,612.60 and 91,090.40

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Solution

The fourth proportional to 340,408.40, 510,612.60 and 91,090.40 is: 136,635.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    340,408.40 : 510,612.60 = 91,090.40 : x
  2. Step 2: Convert to fraction form
    340,408.40/510,612.60 = 91,090.40/x
  3. Step 3: Cross multiply
    340,408.40x = 510,612.60 × 91,090.40
  4. Step 4: Simplify right side
    340,408.40x = 46,511,905,979.04
  5. Step 5: Solve for x
    x = 46,511,905,979.04/340,408.40
  6. Step 6: Final answer
    x = 136,635.60

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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.