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Finding the Fourth Proportional to 86,004.80, 128,812.80 and 51,012.80

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Solution

The fourth proportional to 86,004.80, 128,812.80 and 51,012.80 is: 76,403.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,004.80 : 128,812.80 = 51,012.80 : x
  2. Step 2: Convert to fraction form
    86,004.80/128,812.80 = 51,012.80/x
  3. Step 3: Cross multiply
    86,004.80x = 128,812.80 × 51,012.80
  4. Step 4: Simplify right side
    86,004.80x = 6,571,101,603.84
  5. Step 5: Solve for x
    x = 6,571,101,603.84/86,004.80
  6. Step 6: Final answer
    x = 76,403.89

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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.