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Finding the Fourth Proportional to 1,391,184.48, 1,919,905.92 and 779,300.40

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Solution

The fourth proportional to 1,391,184.48, 1,919,905.92 and 779,300.40 is: 1,075,474.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,184.48 : 1,919,905.92 = 779,300.40 : x
  2. Step 2: Convert to fraction form
    1,391,184.48/1,919,905.92 = 779,300.40/x
  3. Step 3: Cross multiply
    1,391,184.48x = 1,919,905.92 × 779,300.40
  4. Step 4: Simplify right side
    1,391,184.48x = 1,496,183,451,418.37
  5. Step 5: Solve for x
    x = 1,496,183,451,418.37/1,391,184.48
  6. Step 6: Final answer
    x = 1,075,474.51

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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.