Home / 86,341.09-128,878.39-80,009.07

Finding the Fourth Proportional to 86,341.09, 128,878.39 and 80,009.07

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Solution

The fourth proportional to 86,341.09, 128,878.39 and 80,009.07 is: 119,426.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,341.09 : 128,878.39 = 80,009.07 : x
  2. Step 2: Convert to fraction form
    86,341.09/128,878.39 = 80,009.07/x
  3. Step 3: Cross multiply
    86,341.09x = 128,878.39 × 80,009.07
  4. Step 4: Simplify right side
    86,341.09x = 10,311,439,743.71
  5. Step 5: Solve for x
    x = 10,311,439,743.71/86,341.09
  6. Step 6: Final answer
    x = 119,426.80

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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.