Home / 85,415.42-128,080.11-28,469.15

Finding the Fourth Proportional to 85,415.42, 128,080.11 and 28,469.15

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Solution

The fourth proportional to 85,415.42, 128,080.11 and 28,469.15 is: 42,689.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,415.42 : 128,080.11 = 28,469.15 : x
  2. Step 2: Convert to fraction form
    85,415.42/128,080.11 = 28,469.15/x
  3. Step 3: Cross multiply
    85,415.42x = 128,080.11 × 28,469.15
  4. Step 4: Simplify right side
    85,415.42x = 3,646,332,050.42
  5. Step 5: Solve for x
    x = 3,646,332,050.42/85,415.42
  6. Step 6: Final answer
    x = 42,689.39

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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.