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Finding the Fourth Proportional to 86,007.30, 128,816.55 and 51,015.30

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Solution

The fourth proportional to 86,007.30, 128,816.55 and 51,015.30 is: 76,407.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,007.30 : 128,816.55 = 51,015.30 : x
  2. Step 2: Convert to fraction form
    86,007.30/128,816.55 = 51,015.30/x
  3. Step 3: Cross multiply
    86,007.30x = 128,816.55 × 51,015.30
  4. Step 4: Simplify right side
    86,007.30x = 6,571,614,943.22
  5. Step 5: Solve for x
    x = 6,571,614,943.22/86,007.30
  6. Step 6: Final answer
    x = 76,407.64

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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.