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Finding the Fourth Proportional to 85,447.36, 128,171.28 and 38,645.52

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Solution

The fourth proportional to 85,447.36, 128,171.28 and 38,645.52 is: 57,968.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,447.36 : 128,171.28 = 38,645.52 : x
  2. Step 2: Convert to fraction form
    85,447.36/128,171.28 = 38,645.52/x
  3. Step 3: Cross multiply
    85,447.36x = 128,171.28 × 38,645.52
  4. Step 4: Simplify right side
    85,447.36x = 4,953,245,764.67
  5. Step 5: Solve for x
    x = 4,953,245,764.67/85,447.36
  6. Step 6: Final answer
    x = 57,968.39

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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.