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Finding the Fourth Proportional to 1,318,847.10, 1,978,270.65 and 919,938.30

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Solution

The fourth proportional to 1,318,847.10, 1,978,270.65 and 919,938.30 is: 1,379,907.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,847.10 : 1,978,270.65 = 919,938.30 : x
  2. Step 2: Convert to fraction form
    1,318,847.10/1,978,270.65 = 919,938.30/x
  3. Step 3: Cross multiply
    1,318,847.10x = 1,978,270.65 × 919,938.30
  4. Step 4: Simplify right side
    1,318,847.10x = 1,819,886,938,700.90
  5. Step 5: Solve for x
    x = 1,819,886,938,700.90/1,318,847.10
  6. Step 6: Final answer
    x = 1,379,907.45

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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.