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Finding the Fourth Proportional to 129,606, 178,856.28 and 69,990

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Solution

The fourth proportional to 129,606, 178,856.28 and 69,990 is: 96,586.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,606 : 178,856.28 = 69,990 : x
  2. Step 2: Convert to fraction form
    129,606/178,856.28 = 69,990/x
  3. Step 3: Cross multiply
    129,606x = 178,856.28 × 69,990
  4. Step 4: Simplify right side
    129,606x = 12,518,151,037.20
  5. Step 5: Solve for x
    x = 12,518,151,037.20/129,606
  6. Step 6: Final answer
    x = 96,586.20

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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.