Home / 86,289.15-128,740.62-76,816.71

Finding the Fourth Proportional to 86,289.15, 128,740.62 and 76,816.71

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Solution

The fourth proportional to 86,289.15, 128,740.62 and 76,816.71 is: 114,608.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,289.15 : 128,740.62 = 76,816.71 : x
  2. Step 2: Convert to fraction form
    86,289.15/128,740.62 = 76,816.71/x
  3. Step 3: Cross multiply
    86,289.15x = 128,740.62 × 76,816.71
  4. Step 4: Simplify right side
    86,289.15x = 9,889,430,871.76
  5. Step 5: Solve for x
    x = 9,889,430,871.76/86,289.15
  6. Step 6: Final answer
    x = 114,608.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.