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Finding the Fourth Proportional to 38,688.90, 58,054.81 and 20,919.12

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Solution

The fourth proportional to 38,688.90, 58,054.81 and 20,919.12 is: 31,390.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,688.90 : 58,054.81 = 20,919.12 : x
  2. Step 2: Convert to fraction form
    38,688.90/58,054.81 = 20,919.12/x
  3. Step 3: Cross multiply
    38,688.90x = 58,054.81 × 20,919.12
  4. Step 4: Simplify right side
    38,688.90x = 1,214,455,536.97
  5. Step 5: Solve for x
    x = 1,214,455,536.97/38,688.90
  6. Step 6: Final answer
    x = 31,390.28

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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.