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Finding the Fourth Proportional to 209,857.20, 314,785.80 and 115,378.80

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Solution

The fourth proportional to 209,857.20, 314,785.80 and 115,378.80 is: 173,068.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,857.20 : 314,785.80 = 115,378.80 : x
  2. Step 2: Convert to fraction form
    209,857.20/314,785.80 = 115,378.80/x
  3. Step 3: Cross multiply
    209,857.20x = 314,785.80 × 115,378.80
  4. Step 4: Simplify right side
    209,857.20x = 36,319,607,861.04
  5. Step 5: Solve for x
    x = 36,319,607,861.04/209,857.20
  6. Step 6: Final answer
    x = 173,068.20

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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.