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Finding the Fourth Proportional to 85,572.10, 128,409.05 and 45,620.47

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Solution

The fourth proportional to 85,572.10, 128,409.05 and 45,620.47 is: 68,457.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,572.10 : 128,409.05 = 45,620.47 : x
  2. Step 2: Convert to fraction form
    85,572.10/128,409.05 = 45,620.47/x
  3. Step 3: Cross multiply
    85,572.10x = 128,409.05 × 45,620.47
  4. Step 4: Simplify right side
    85,572.10x = 5,858,081,213.25
  5. Step 5: Solve for x
    x = 5,858,081,213.25/85,572.10
  6. Step 6: Final answer
    x = 68,457.84

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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.