Home / 85,839.60-128,739.96-38,429.76

Finding the Fourth Proportional to 85,839.60, 128,739.96 and 38,429.76

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Solution

The fourth proportional to 85,839.60, 128,739.96 and 38,429.76 is: 57,635.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839.60 : 128,739.96 = 38,429.76 : x
  2. Step 2: Convert to fraction form
    85,839.60/128,739.96 = 38,429.76/x
  3. Step 3: Cross multiply
    85,839.60x = 128,739.96 × 38,429.76
  4. Step 4: Simplify right side
    85,839.60x = 4,947,445,765.21
  5. Step 5: Solve for x
    x = 4,947,445,765.21/85,839.60
  6. Step 6: Final answer
    x = 57,635.94

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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.