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Finding the Fourth Proportional to 85,706.78, 128,510.87 and 45,676.44

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Solution

The fourth proportional to 85,706.78, 128,510.87 and 45,676.44 is: 68,488.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,706.78 : 128,510.87 = 45,676.44 : x
  2. Step 2: Convert to fraction form
    85,706.78/128,510.87 = 45,676.44/x
  3. Step 3: Cross multiply
    85,706.78x = 128,510.87 × 45,676.44
  4. Step 4: Simplify right side
    85,706.78x = 5,869,918,814.52
  5. Step 5: Solve for x
    x = 5,869,918,814.52/85,706.78
  6. Step 6: Final answer
    x = 68,488.39

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1.5x scale

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.