Home / 1,390,638.15-1,917,618.20-1,028,815.40

Finding the Fourth Proportional to 1,390,638.15, 1,917,618.20 and 1,028,815.40

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Solution

The fourth proportional to 1,390,638.15, 1,917,618.20 and 1,028,815.40 is: 1,418,683.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,638.15 : 1,917,618.20 = 1,028,815.40 : x
  2. Step 2: Convert to fraction form
    1,390,638.15/1,917,618.20 = 1,028,815.40/x
  3. Step 3: Cross multiply
    1,390,638.15x = 1,917,618.20 × 1,028,815.40
  4. Step 4: Simplify right side
    1,390,638.15x = 1,972,875,135,480.28
  5. Step 5: Solve for x
    x = 1,972,875,135,480.28/1,390,638.15
  6. Step 6: Final answer
    x = 1,418,683.31

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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.