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Finding the Fourth Proportional to 85,454.91, 128,262.78 and 43,365.21

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Solution

The fourth proportional to 85,454.91, 128,262.78 and 43,365.21 is: 65,088.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,454.91 : 128,262.78 = 43,365.21 : x
  2. Step 2: Convert to fraction form
    85,454.91/128,262.78 = 43,365.21/x
  3. Step 3: Cross multiply
    85,454.91x = 128,262.78 × 43,365.21
  4. Step 4: Simplify right side
    85,454.91x = 5,562,142,389.88
  5. Step 5: Solve for x
    x = 5,562,142,389.88/85,454.91
  6. Step 6: Final answer
    x = 65,088.62

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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.