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Finding the Fourth Proportional to 1,405,144.80, 1,938,581.10 and 921,978.18

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Solution

The fourth proportional to 1,405,144.80, 1,938,581.10 and 921,978.18 is: 1,271,989.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,144.80 : 1,938,581.10 = 921,978.18 : x
  2. Step 2: Convert to fraction form
    1,405,144.80/1,938,581.10 = 921,978.18/x
  3. Step 3: Cross multiply
    1,405,144.80x = 1,938,581.10 × 921,978.18
  4. Step 4: Simplify right side
    1,405,144.80x = 1,787,329,474,360.40
  5. Step 5: Solve for x
    x = 1,787,329,474,360.40/1,405,144.80
  6. Step 6: Final answer
    x = 1,271,989.53

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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.