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Finding the Fourth Proportional to 72,690.40, 108,954.60 and 28,302.40

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Solution

The fourth proportional to 72,690.40, 108,954.60 and 28,302.40 is: 42,422.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,690.40 : 108,954.60 = 28,302.40 : x
  2. Step 2: Convert to fraction form
    72,690.40/108,954.60 = 28,302.40/x
  3. Step 3: Cross multiply
    72,690.40x = 108,954.60 × 28,302.40
  4. Step 4: Simplify right side
    72,690.40x = 3,083,676,671.04
  5. Step 5: Solve for x
    x = 3,083,676,671.04/72,690.40
  6. Step 6: Final answer
    x = 42,422.06

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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.