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Finding the Fourth Proportional to 209,211.80, 313,817.70 and 129,313.40

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Solution

The fourth proportional to 209,211.80, 313,817.70 and 129,313.40 is: 193,970.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,211.80 : 313,817.70 = 129,313.40 : x
  2. Step 2: Convert to fraction form
    209,211.80/313,817.70 = 129,313.40/x
  3. Step 3: Cross multiply
    209,211.80x = 313,817.70 × 129,313.40
  4. Step 4: Simplify right side
    209,211.80x = 40,580,833,767.18
  5. Step 5: Solve for x
    x = 40,580,833,767.18/209,211.80
  6. Step 6: Final answer
    x = 193,970.10

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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.