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Finding the Fourth Proportional to 278,569.72, 417,874.02 and 120,807.64

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Solution

The fourth proportional to 278,569.72, 417,874.02 and 120,807.64 is: 181,219.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,569.72 : 417,874.02 = 120,807.64 : x
  2. Step 2: Convert to fraction form
    278,569.72/417,874.02 = 120,807.64/x
  3. Step 3: Cross multiply
    278,569.72x = 417,874.02 × 120,807.64
  4. Step 4: Simplify right side
    278,569.72x = 50,482,374,173.51
  5. Step 5: Solve for x
    x = 50,482,374,173.51/278,569.72
  6. Step 6: Final answer
    x = 181,219.89

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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.