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Finding the Fourth Proportional to 85,992.40, 128,988.60 and 57,998.80

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Solution

The fourth proportional to 85,992.40, 128,988.60 and 57,998.80 is: 86,998.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,992.40 : 128,988.60 = 57,998.80 : x
  2. Step 2: Convert to fraction form
    85,992.40/128,988.60 = 57,998.80/x
  3. Step 3: Cross multiply
    85,992.40x = 128,988.60 × 57,998.80
  4. Step 4: Simplify right side
    85,992.40x = 7,481,184,013.68
  5. Step 5: Solve for x
    x = 7,481,184,013.68/85,992.40
  6. Step 6: Final answer
    x = 86,998.20

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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.