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Finding the Fourth Proportional to 1,281,976.76, 1,921,390.44 and 719,830.28

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Solution

The fourth proportional to 1,281,976.76, 1,921,390.44 and 719,830.28 is: 1,078,861.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281,976.76 : 1,921,390.44 = 719,830.28 : x
  2. Step 2: Convert to fraction form
    1,281,976.76/1,921,390.44 = 719,830.28/x
  3. Step 3: Cross multiply
    1,281,976.76x = 1,921,390.44 × 719,830.28
  4. Step 4: Simplify right side
    1,281,976.76x = 1,383,075,018,414.52
  5. Step 5: Solve for x
    x = 1,383,075,018,414.52/1,281,976.76
  6. Step 6: Final answer
    x = 1,078,861.23

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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.