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Finding the Fourth Proportional to 339,425.40, 509,138.10 and 86,705.40

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Solution

The fourth proportional to 339,425.40, 509,138.10 and 86,705.40 is: 130,058.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,425.40 : 509,138.10 = 86,705.40 : x
  2. Step 2: Convert to fraction form
    339,425.40/509,138.10 = 86,705.40/x
  3. Step 3: Cross multiply
    339,425.40x = 509,138.10 × 86,705.40
  4. Step 4: Simplify right side
    339,425.40x = 44,145,022,615.74
  5. Step 5: Solve for x
    x = 44,145,022,615.74/339,425.40
  6. Step 6: Final answer
    x = 130,058.10

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1.5x scale

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.