Home / 85,965,337.80-128,948,006.70-78,029,152.20

Finding the Fourth Proportional to 85,965,337.80, 128,948,006.70 and 78,029,152.20

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Solution

The fourth proportional to 85,965,337.80, 128,948,006.70 and 78,029,152.20 is: 117,043,728.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965,337.80 : 128,948,006.70 = 78,029,152.20 : x
  2. Step 2: Convert to fraction form
    85,965,337.80/128,948,006.70 = 78,029,152.20/x
  3. Step 3: Cross multiply
    85,965,337.80x = 128,948,006.70 × 78,029,152.20
  4. Step 4: Simplify right side
    85,965,337.80x = 10,061,703,640,680,920
  5. Step 5: Solve for x
    x = 10,061,703,640,680,920/85,965,337.80
  6. Step 6: Final answer
    x = 117,043,728.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.