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Finding the Fourth Proportional to 209,886.80, 314,830.20 and 115,408.40

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Solution

The fourth proportional to 209,886.80, 314,830.20 and 115,408.40 is: 173,112.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,886.80 : 314,830.20 = 115,408.40 : x
  2. Step 2: Convert to fraction form
    209,886.80/314,830.20 = 115,408.40/x
  3. Step 3: Cross multiply
    209,886.80x = 314,830.20 × 115,408.40
  4. Step 4: Simplify right side
    209,886.80x = 36,334,049,653.68
  5. Step 5: Solve for x
    x = 36,334,049,653.68/209,886.80
  6. Step 6: Final answer
    x = 173,112.60

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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.