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Finding the Fourth Proportional to 129,772, 179,085.54 and 70,156

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Solution

The fourth proportional to 129,772, 179,085.54 and 70,156 is: 96,815.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,772 : 179,085.54 = 70,156 : x
  2. Step 2: Convert to fraction form
    129,772/179,085.54 = 70,156/x
  3. Step 3: Cross multiply
    129,772x = 179,085.54 × 70,156
  4. Step 4: Simplify right side
    129,772x = 12,563,925,144.24
  5. Step 5: Solve for x
    x = 12,563,925,144.24/129,772
  6. Step 6: Final answer
    x = 96,815.38

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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.