Home / 85,719.80-128,579.70-30,315.80

Finding the Fourth Proportional to 85,719.80, 128,579.70 and 30,315.80

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Solution

The fourth proportional to 85,719.80, 128,579.70 and 30,315.80 is: 45,473.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,719.80 : 128,579.70 = 30,315.80 : x
  2. Step 2: Convert to fraction form
    85,719.80/128,579.70 = 30,315.80/x
  3. Step 3: Cross multiply
    85,719.80x = 128,579.70 × 30,315.80
  4. Step 4: Simplify right side
    85,719.80x = 3,897,996,469.26
  5. Step 5: Solve for x
    x = 3,897,996,469.26/85,719.80
  6. Step 6: Final answer
    x = 45,473.70

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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.