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Finding the Fourth Proportional to 85,416.36, 128,151.90 and 38,656.68

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Solution

The fourth proportional to 85,416.36, 128,151.90 and 38,656.68 is: 57,997.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,416.36 : 128,151.90 = 38,656.68 : x
  2. Step 2: Convert to fraction form
    85,416.36/128,151.90 = 38,656.68/x
  3. Step 3: Cross multiply
    85,416.36x = 128,151.90 × 38,656.68
  4. Step 4: Simplify right side
    85,416.36x = 4,953,926,989.69
  5. Step 5: Solve for x
    x = 4,953,926,989.69/85,416.36
  6. Step 6: Final answer
    x = 57,997.40

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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.