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Finding the Fourth Proportional to 1,385,977.73, 1,912,629.10 and 774,139.19

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Solution

The fourth proportional to 1,385,977.73, 1,912,629.10 and 774,139.19 is: 1,068,300.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385,977.73 : 1,912,629.10 = 774,139.19 : x
  2. Step 2: Convert to fraction form
    1,385,977.73/1,912,629.10 = 774,139.19/x
  3. Step 3: Cross multiply
    1,385,977.73x = 1,912,629.10 × 774,139.19
  4. Step 4: Simplify right side
    1,385,977.73x = 1,480,641,138,373.73
  5. Step 5: Solve for x
    x = 1,480,641,138,373.73/1,385,977.73
  6. Step 6: Final answer
    x = 1,068,300.81

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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.