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Finding the Fourth Proportional to 85,920.25, 128,707.92 and 43,798.63

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Solution

The fourth proportional to 85,920.25, 128,707.92 and 43,798.63 is: 65,610.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.25 : 128,707.92 = 43,798.63 : x
  2. Step 2: Convert to fraction form
    85,920.25/128,707.92 = 43,798.63/x
  3. Step 3: Cross multiply
    85,920.25x = 128,707.92 × 43,798.63
  4. Step 4: Simplify right side
    85,920.25x = 5,637,230,566.15
  5. Step 5: Solve for x
    x = 5,637,230,566.15/85,920.25
  6. Step 6: Final answer
    x = 65,610.03

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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.