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Finding the Fourth Proportional to 72,938.66, 109,364.18 and 28,512.50

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Solution

The fourth proportional to 72,938.66, 109,364.18 and 28,512.50 is: 42,751.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,938.66 : 109,364.18 = 28,512.50 : x
  2. Step 2: Convert to fraction form
    72,938.66/109,364.18 = 28,512.50/x
  3. Step 3: Cross multiply
    72,938.66x = 109,364.18 × 28,512.50
  4. Step 4: Simplify right side
    72,938.66x = 3,118,245,492.87
  5. Step 5: Solve for x
    x = 3,118,245,492.87/72,938.66
  6. Step 6: Final answer
    x = 42,751.62

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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.