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Finding the Fourth Proportional to 74,690.40, 112,032.90 and 30,315.90

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Solution

The fourth proportional to 74,690.40, 112,032.90 and 30,315.90 is: 45,472.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,690.40 : 112,032.90 = 30,315.90 : x
  2. Step 2: Convert to fraction form
    74,690.40/112,032.90 = 30,315.90/x
  3. Step 3: Cross multiply
    74,690.40x = 112,032.90 × 30,315.90
  4. Step 4: Simplify right side
    74,690.40x = 3,396,378,193.11
  5. Step 5: Solve for x
    x = 3,396,378,193.11/74,690.40
  6. Step 6: Final answer
    x = 45,472.75

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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.