Home / 1,290,420-1,780,779.60-725,172

Finding the Fourth Proportional to 1,290,420, 1,780,779.60 and 725,172

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Solution

The fourth proportional to 1,290,420, 1,780,779.60 and 725,172 is: 1,000,737.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,420 : 1,780,779.60 = 725,172 : x
  2. Step 2: Convert to fraction form
    1,290,420/1,780,779.60 = 725,172/x
  3. Step 3: Cross multiply
    1,290,420x = 1,780,779.60 × 725,172
  4. Step 4: Simplify right side
    1,290,420x = 1,291,371,504,091.20
  5. Step 5: Solve for x
    x = 1,291,371,504,091.20/1,290,420
  6. Step 6: Final answer
    x = 1,000,737.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.