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Finding the Fourth Proportional to 66,894.50, 100,390.62 and 53,903.72

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Solution

The fourth proportional to 66,894.50, 100,390.62 and 53,903.72 is: 80,894.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,894.50 : 100,390.62 = 53,903.72 : x
  2. Step 2: Convert to fraction form
    66,894.50/100,390.62 = 53,903.72/x
  3. Step 3: Cross multiply
    66,894.50x = 100,390.62 × 53,903.72
  4. Step 4: Simplify right side
    66,894.50x = 5,411,427,871.11
  5. Step 5: Solve for x
    x = 5,411,427,871.11/66,894.50
  6. Step 6: Final answer
    x = 80,894.96

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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.