Home / 85,828.30-128,742.45-39,172.30

Finding the Fourth Proportional to 85,828.30, 128,742.45 and 39,172.30

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Solution

The fourth proportional to 85,828.30, 128,742.45 and 39,172.30 is: 58,758.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,828.30 : 128,742.45 = 39,172.30 : x
  2. Step 2: Convert to fraction form
    85,828.30/128,742.45 = 39,172.30/x
  3. Step 3: Cross multiply
    85,828.30x = 128,742.45 × 39,172.30
  4. Step 4: Simplify right side
    85,828.30x = 5,043,137,874.14
  5. Step 5: Solve for x
    x = 5,043,137,874.14/85,828.30
  6. Step 6: Final answer
    x = 58,758.45

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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.