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Finding the Fourth Proportional to 85,765.74, 128,624.25 and 54,128.40

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Solution

The fourth proportional to 85,765.74, 128,624.25 and 54,128.40 is: 81,177.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,765.74 : 128,624.25 = 54,128.40 : x
  2. Step 2: Convert to fraction form
    85,765.74/128,624.25 = 54,128.40/x
  3. Step 3: Cross multiply
    85,765.74x = 128,624.25 × 54,128.40
  4. Step 4: Simplify right side
    85,765.74x = 6,962,225,297.85
  5. Step 5: Solve for x
    x = 6,962,225,297.85/85,765.74
  6. Step 6: Final answer
    x = 81,177.23

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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.