Home / 85,899.46-128,151.71-81,249.35

Finding the Fourth Proportional to 85,899.46, 128,151.71 and 81,249.35

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Solution

The fourth proportional to 85,899.46, 128,151.71 and 81,249.35 is: 121,214.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,899.46 : 128,151.71 = 81,249.35 : x
  2. Step 2: Convert to fraction form
    85,899.46/128,151.71 = 81,249.35/x
  3. Step 3: Cross multiply
    85,899.46x = 128,151.71 × 81,249.35
  4. Step 4: Simplify right side
    85,899.46x = 10,412,243,877.75
  5. Step 5: Solve for x
    x = 10,412,243,877.75/85,899.46
  6. Step 6: Final answer
    x = 121,214.31

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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.