Home / 1,287,136.80-1,930,705.20-815,911.20

Finding the Fourth Proportional to 1,287,136.80, 1,930,705.20 and 815,911.20

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Solution

The fourth proportional to 1,287,136.80, 1,930,705.20 and 815,911.20 is: 1,223,866.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,136.80 : 1,930,705.20 = 815,911.20 : x
  2. Step 2: Convert to fraction form
    1,287,136.80/1,930,705.20 = 815,911.20/x
  3. Step 3: Cross multiply
    1,287,136.80x = 1,930,705.20 × 815,911.20
  4. Step 4: Simplify right side
    1,287,136.80x = 1,575,283,996,578.24
  5. Step 5: Solve for x
    x = 1,575,283,996,578.24/1,287,136.80
  6. Step 6: Final answer
    x = 1,223,866.80

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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.