Home / 85,409.10-128,047.32-55,359.90

Finding the Fourth Proportional to 85,409.10, 128,047.32 and 55,359.90

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Solution

The fourth proportional to 85,409.10, 128,047.32 and 55,359.90 is: 82,996.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,409.10 : 128,047.32 = 55,359.90 : x
  2. Step 2: Convert to fraction form
    85,409.10/128,047.32 = 55,359.90/x
  3. Step 3: Cross multiply
    85,409.10x = 128,047.32 × 55,359.90
  4. Step 4: Simplify right side
    85,409.10x = 7,088,686,830.47
  5. Step 5: Solve for x
    x = 7,088,686,830.47/85,409.10
  6. Step 6: Final answer
    x = 82,996.86

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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.