Home / 85,511.07-128,268.78-40,521.87

Finding the Fourth Proportional to 85,511.07, 128,268.78 and 40,521.87

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Solution

The fourth proportional to 85,511.07, 128,268.78 and 40,521.87 is: 60,783.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,511.07 : 128,268.78 = 40,521.87 : x
  2. Step 2: Convert to fraction form
    85,511.07/128,268.78 = 40,521.87/x
  3. Step 3: Cross multiply
    85,511.07x = 128,268.78 × 40,521.87
  4. Step 4: Simplify right side
    85,511.07x = 5,197,690,828.22
  5. Step 5: Solve for x
    x = 5,197,690,828.22/85,511.07
  6. Step 6: Final answer
    x = 60,783.84

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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.