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Finding the Fourth Proportional to 790,318.40, 1,181,978.40 and 664,347.20

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Solution

The fourth proportional to 790,318.40, 1,181,978.40 and 664,347.20 is: 993,579.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    790,318.40 : 1,181,978.40 = 664,347.20 : x
  2. Step 2: Convert to fraction form
    790,318.40/1,181,978.40 = 664,347.20/x
  3. Step 3: Cross multiply
    790,318.40x = 1,181,978.40 × 664,347.20
  4. Step 4: Simplify right side
    790,318.40x = 785,244,040,500.48
  5. Step 5: Solve for x
    x = 785,244,040,500.48/790,318.40
  6. Step 6: Final answer
    x = 993,579.35

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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.