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Finding the Fourth Proportional to 139,818.72, 209,678.67 and 45,045.08

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Solution

The fourth proportional to 139,818.72, 209,678.67 and 45,045.08 is: 67,551.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,818.72 : 209,678.67 = 45,045.08 : x
  2. Step 2: Convert to fraction form
    139,818.72/209,678.67 = 45,045.08/x
  3. Step 3: Cross multiply
    139,818.72x = 209,678.67 × 45,045.08
  4. Step 4: Simplify right side
    139,818.72x = 9,444,992,464.44
  5. Step 5: Solve for x
    x = 9,444,992,464.44/139,818.72
  6. Step 6: Final answer
    x = 67,551.70

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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.