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Finding the Fourth Proportional to 85,131, 127,720.80 and 28,983.42

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Solution

The fourth proportional to 85,131, 127,720.80 and 28,983.42 is: 43,483.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,131 : 127,720.80 = 28,983.42 : x
  2. Step 2: Convert to fraction form
    85,131/127,720.80 = 28,983.42/x
  3. Step 3: Cross multiply
    85,131x = 127,720.80 × 28,983.42
  4. Step 4: Simplify right side
    85,131x = 3,701,785,589.14
  5. Step 5: Solve for x
    x = 3,701,785,589.14/85,131
  6. Step 6: Final answer
    x = 43,483.40

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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.