Home / 85,739.10-128,608.65-54,246.30

Finding the Fourth Proportional to 85,739.10, 128,608.65 and 54,246.30

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Solution

The fourth proportional to 85,739.10, 128,608.65 and 54,246.30 is: 81,369.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,739.10 : 128,608.65 = 54,246.30 : x
  2. Step 2: Convert to fraction form
    85,739.10/128,608.65 = 54,246.30/x
  3. Step 3: Cross multiply
    85,739.10x = 128,608.65 × 54,246.30
  4. Step 4: Simplify right side
    85,739.10x = 6,976,543,410.50
  5. Step 5: Solve for x
    x = 6,976,543,410.50/85,739.10
  6. Step 6: Final answer
    x = 81,369.45

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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.