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Finding the Fourth Proportional to 85,846.70, 128,915.85 and 63,685.10

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Solution

The fourth proportional to 85,846.70, 128,915.85 and 63,685.10 is: 95,635.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,846.70 : 128,915.85 = 63,685.10 : x
  2. Step 2: Convert to fraction form
    85,846.70/128,915.85 = 63,685.10/x
  3. Step 3: Cross multiply
    85,846.70x = 128,915.85 × 63,685.10
  4. Step 4: Simplify right side
    85,846.70x = 8,210,018,798.84
  5. Step 5: Solve for x
    x = 8,210,018,798.84/85,846.70
  6. Step 6: Final answer
    x = 95,635.81

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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.