Home / 820,136.80-1,230,205.20-687,426.40

Finding the Fourth Proportional to 820,136.80, 1,230,205.20 and 687,426.40

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Solution

The fourth proportional to 820,136.80, 1,230,205.20 and 687,426.40 is: 1,031,139.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,136.80 : 1,230,205.20 = 687,426.40 : x
  2. Step 2: Convert to fraction form
    820,136.80/1,230,205.20 = 687,426.40/x
  3. Step 3: Cross multiply
    820,136.80x = 1,230,205.20 × 687,426.40
  4. Step 4: Simplify right side
    820,136.80x = 845,675,531,897.28
  5. Step 5: Solve for x
    x = 845,675,531,897.28/820,136.80
  6. Step 6: Final answer
    x = 1,031,139.60

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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.