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Finding the Fourth Proportional to 39,892.34, 55,051.45 and 21,742.94

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Solution

The fourth proportional to 39,892.34, 55,051.45 and 21,742.94 is: 30,005.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,892.34 : 55,051.45 = 21,742.94 : x
  2. Step 2: Convert to fraction form
    39,892.34/55,051.45 = 21,742.94/x
  3. Step 3: Cross multiply
    39,892.34x = 55,051.45 × 21,742.94
  4. Step 4: Simplify right side
    39,892.34x = 1,196,980,457.53
  5. Step 5: Solve for x
    x = 1,196,980,457.53/39,892.34
  6. Step 6: Final answer
    x = 30,005.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.