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Finding the Fourth Proportional to 129,896, 179,256.48 and 70,280

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Solution

The fourth proportional to 129,896, 179,256.48 and 70,280 is: 96,986.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,896 : 179,256.48 = 70,280 : x
  2. Step 2: Convert to fraction form
    129,896/179,256.48 = 70,280/x
  3. Step 3: Cross multiply
    129,896x = 179,256.48 × 70,280
  4. Step 4: Simplify right side
    129,896x = 12,598,145,414.40
  5. Step 5: Solve for x
    x = 12,598,145,414.40/129,896
  6. Step 6: Final answer
    x = 96,986.40

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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.