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Finding the Fourth Proportional to 85,651.80, 128,477.70 and 30,247.80

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Solution

The fourth proportional to 85,651.80, 128,477.70 and 30,247.80 is: 45,371.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,651.80 : 128,477.70 = 30,247.80 : x
  2. Step 2: Convert to fraction form
    85,651.80/128,477.70 = 30,247.80/x
  3. Step 3: Cross multiply
    85,651.80x = 128,477.70 × 30,247.80
  4. Step 4: Simplify right side
    85,651.80x = 3,886,167,774.06
  5. Step 5: Solve for x
    x = 3,886,167,774.06/85,651.80
  6. Step 6: Final answer
    x = 45,371.70

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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.