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Finding the Fourth Proportional to 129,289.38, 178,420.41 and 72,700.26

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Solution

The fourth proportional to 129,289.38, 178,420.41 and 72,700.26 is: 100,326.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,289.38 : 178,420.41 = 72,700.26 : x
  2. Step 2: Convert to fraction form
    129,289.38/178,420.41 = 72,700.26/x
  3. Step 3: Cross multiply
    129,289.38x = 178,420.41 × 72,700.26
  4. Step 4: Simplify right side
    129,289.38x = 12,971,210,196.31
  5. Step 5: Solve for x
    x = 12,971,210,196.31/129,289.38
  6. Step 6: Final answer
    x = 100,326.96

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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.