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Finding the Fourth Proportional to 810,660.40, 1,212,491.40 and 684,689.20

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Solution

The fourth proportional to 810,660.40, 1,212,491.40 and 684,689.20 is: 1,024,078.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,660.40 : 1,212,491.40 = 684,689.20 : x
  2. Step 2: Convert to fraction form
    810,660.40/1,212,491.40 = 684,689.20/x
  3. Step 3: Cross multiply
    810,660.40x = 1,212,491.40 × 684,689.20
  4. Step 4: Simplify right side
    810,660.40x = 830,179,766,672.88
  5. Step 5: Solve for x
    x = 830,179,766,672.88/810,660.40
  6. Step 6: Final answer
    x = 1,024,078.35

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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.