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Finding the Fourth Proportional to 85,903.99, 128,683.76 and 68,164.69

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Solution

The fourth proportional to 85,903.99, 128,683.76 and 68,164.69 is: 102,110.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,903.99 : 128,683.76 = 68,164.69 : x
  2. Step 2: Convert to fraction form
    85,903.99/128,683.76 = 68,164.69/x
  3. Step 3: Cross multiply
    85,903.99x = 128,683.76 × 68,164.69
  4. Step 4: Simplify right side
    85,903.99x = 8,771,688,762.32
  5. Step 5: Solve for x
    x = 8,771,688,762.32/85,903.99
  6. Step 6: Final answer
    x = 102,110.37

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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.