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Finding the Fourth Proportional to 85,100.48, 128,287.84 and 79,391.60

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Solution

The fourth proportional to 85,100.48, 128,287.84 and 79,391.60 is: 119,681.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,100.48 : 128,287.84 = 79,391.60 : x
  2. Step 2: Convert to fraction form
    85,100.48/128,287.84 = 79,391.60/x
  3. Step 3: Cross multiply
    85,100.48x = 128,287.84 × 79,391.60
  4. Step 4: Simplify right side
    85,100.48x = 10,184,976,878.14
  5. Step 5: Solve for x
    x = 10,184,976,878.14/85,100.48
  6. Step 6: Final answer
    x = 119,681.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.