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Finding the Fourth Proportional to 85,485.20, 128,227.80 and 46,119.20

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Solution

The fourth proportional to 85,485.20, 128,227.80 and 46,119.20 is: 69,178.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,485.20 : 128,227.80 = 46,119.20 : x
  2. Step 2: Convert to fraction form
    85,485.20/128,227.80 = 46,119.20/x
  3. Step 3: Cross multiply
    85,485.20x = 128,227.80 × 46,119.20
  4. Step 4: Simplify right side
    85,485.20x = 5,913,763,553.76
  5. Step 5: Solve for x
    x = 5,913,763,553.76/85,485.20
  6. Step 6: Final answer
    x = 69,178.80

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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.