Home / 85,609.13-128,414.10-30,205.13

Finding the Fourth Proportional to 85,609.13, 128,414.10 and 30,205.13

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Solution

The fourth proportional to 85,609.13, 128,414.10 and 30,205.13 is: 45,307.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,609.13 : 128,414.10 = 30,205.13 : x
  2. Step 2: Convert to fraction form
    85,609.13/128,414.10 = 30,205.13/x
  3. Step 3: Cross multiply
    85,609.13x = 128,414.10 × 30,205.13
  4. Step 4: Simplify right side
    85,609.13x = 3,878,763,942.26
  5. Step 5: Solve for x
    x = 3,878,763,942.26/85,609.13
  6. Step 6: Final answer
    x = 45,307.83

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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.