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Finding the Fourth Proportional to 129,616, 178,870.08 and 70,000

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Solution

The fourth proportional to 129,616, 178,870.08 and 70,000 is: 96,600

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,616 : 178,870.08 = 70,000 : x
  2. Step 2: Convert to fraction form
    129,616/178,870.08 = 70,000/x
  3. Step 3: Cross multiply
    129,616x = 178,870.08 × 70,000
  4. Step 4: Simplify right side
    129,616x = 12,520,905,600
  5. Step 5: Solve for x
    x = 12,520,905,600/129,616
  6. Step 6: Final answer
    x = 96,600

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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.