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Finding the Fourth Proportional to 208,546.60, 312,819.90 and 129,620.20

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Solution

The fourth proportional to 208,546.60, 312,819.90 and 129,620.20 is: 194,430.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,546.60 : 312,819.90 = 129,620.20 : x
  2. Step 2: Convert to fraction form
    208,546.60/312,819.90 = 129,620.20/x
  3. Step 3: Cross multiply
    208,546.60x = 312,819.90 × 129,620.20
  4. Step 4: Simplify right side
    208,546.60x = 40,547,778,001.98
  5. Step 5: Solve for x
    x = 40,547,778,001.98/208,546.60
  6. Step 6: Final answer
    x = 194,430.30

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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.