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Finding the Fourth Proportional to 1,210,339.80, 1,819,446.30 and 857,795.40

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Solution

The fourth proportional to 1,210,339.80, 1,819,446.30 and 857,795.40 is: 1,289,483.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210,339.80 : 1,819,446.30 = 857,795.40 : x
  2. Step 2: Convert to fraction form
    1,210,339.80/1,819,446.30 = 857,795.40/x
  3. Step 3: Cross multiply
    1,210,339.80x = 1,819,446.30 × 857,795.40
  4. Step 4: Simplify right side
    1,210,339.80x = 1,560,712,666,687.02
  5. Step 5: Solve for x
    x = 1,560,712,666,687.02/1,210,339.80
  6. Step 6: Final answer
    x = 1,289,483.06

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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.