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Finding the Fourth Proportional to 85,884.40, 128,853.42 and 38,539.18

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Solution

The fourth proportional to 85,884.40, 128,853.42 and 38,539.18 is: 57,820.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,884.40 : 128,853.42 = 38,539.18 : x
  2. Step 2: Convert to fraction form
    85,884.40/128,853.42 = 38,539.18/x
  3. Step 3: Cross multiply
    85,884.40x = 128,853.42 × 38,539.18
  4. Step 4: Simplify right side
    85,884.40x = 4,965,905,147.00
  5. Step 5: Solve for x
    x = 4,965,905,147.00/85,884.40
  6. Step 6: Final answer
    x = 57,820.81

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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.