Home / 1,287,128.30-1,930,692.45-815,902.70

Finding the Fourth Proportional to 1,287,128.30, 1,930,692.45 and 815,902.70

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Solution

The fourth proportional to 1,287,128.30, 1,930,692.45 and 815,902.70 is: 1,223,854.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,128.30 : 1,930,692.45 = 815,902.70 : x
  2. Step 2: Convert to fraction form
    1,287,128.30/1,930,692.45 = 815,902.70/x
  3. Step 3: Cross multiply
    1,287,128.30x = 1,930,692.45 × 815,902.70
  4. Step 4: Simplify right side
    1,287,128.30x = 1,575,257,182,824.62
  5. Step 5: Solve for x
    x = 1,575,257,182,824.62/1,287,128.30
  6. Step 6: Final answer
    x = 1,223,854.05

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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.