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Finding the Fourth Proportional to 74,690.91, 103,078.55 and 45,631.71

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Solution

The fourth proportional to 74,690.91, 103,078.55 and 45,631.71 is: 62,974.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,690.91 : 103,078.55 = 45,631.71 : x
  2. Step 2: Convert to fraction form
    74,690.91/103,078.55 = 45,631.71/x
  3. Step 3: Cross multiply
    74,690.91x = 103,078.55 × 45,631.71
  4. Step 4: Simplify right side
    74,690.91x = 4,703,650,500.82
  5. Step 5: Solve for x
    x = 4,703,650,500.82/74,690.91
  6. Step 6: Final answer
    x = 62,974.87

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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.