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Finding the Fourth Proportional to 859,809.80, 1,289,714.70 and 777,141.20

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Solution

The fourth proportional to 859,809.80, 1,289,714.70 and 777,141.20 is: 1,165,711.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,809.80 : 1,289,714.70 = 777,141.20 : x
  2. Step 2: Convert to fraction form
    859,809.80/1,289,714.70 = 777,141.20/x
  3. Step 3: Cross multiply
    859,809.80x = 1,289,714.70 × 777,141.20
  4. Step 4: Simplify right side
    859,809.80x = 1,002,290,429,615.64
  5. Step 5: Solve for x
    x = 1,002,290,429,615.64/859,809.80
  6. Step 6: Final answer
    x = 1,165,711.80

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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.