Home / 1,405,138.30-1,938,572.13-921,971.68

Finding the Fourth Proportional to 1,405,138.30, 1,938,572.13 and 921,971.68

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Solution

The fourth proportional to 1,405,138.30, 1,938,572.13 and 921,971.68 is: 1,271,980.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,138.30 : 1,938,572.13 = 921,971.68 : x
  2. Step 2: Convert to fraction form
    1,405,138.30/1,938,572.13 = 921,971.68/x
  3. Step 3: Cross multiply
    1,405,138.30x = 1,938,572.13 × 921,971.68
  4. Step 4: Simplify right side
    1,405,138.30x = 1,787,308,603,497.28
  5. Step 5: Solve for x
    x = 1,787,308,603,497.28/1,405,138.30
  6. Step 6: Final answer
    x = 1,271,980.56

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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.