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Finding the Fourth Proportional to 85,677.40, 128,477.70 and 38,906.20

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Solution

The fourth proportional to 85,677.40, 128,477.70 and 38,906.20 is: 58,341.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,677.40 : 128,477.70 = 38,906.20 : x
  2. Step 2: Convert to fraction form
    85,677.40/128,477.70 = 38,906.20/x
  3. Step 3: Cross multiply
    85,677.40x = 128,477.70 × 38,906.20
  4. Step 4: Simplify right side
    85,677.40x = 4,998,579,091.74
  5. Step 5: Solve for x
    x = 4,998,579,091.74/85,677.40
  6. Step 6: Final answer
    x = 58,341.86

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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.