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Finding the Fourth Proportional to 859,697.80, 1,289,546.70 and 660,401.80

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Solution

The fourth proportional to 859,697.80, 1,289,546.70 and 660,401.80 is: 990,602.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,697.80 : 1,289,546.70 = 660,401.80 : x
  2. Step 2: Convert to fraction form
    859,697.80/1,289,546.70 = 660,401.80/x
  3. Step 3: Cross multiply
    859,697.80x = 1,289,546.70 × 660,401.80
  4. Step 4: Simplify right side
    859,697.80x = 851,618,961,864.06
  5. Step 5: Solve for x
    x = 851,618,961,864.06/859,697.80
  6. Step 6: Final answer
    x = 990,602.70

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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.