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Finding the Fourth Proportional to 17,638.60, 26,457.90 and 14,139.40

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Solution

The fourth proportional to 17,638.60, 26,457.90 and 14,139.40 is: 21,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,638.60 : 26,457.90 = 14,139.40 : x
  2. Step 2: Convert to fraction form
    17,638.60/26,457.90 = 14,139.40/x
  3. Step 3: Cross multiply
    17,638.60x = 26,457.90 × 14,139.40
  4. Step 4: Simplify right side
    17,638.60x = 374,098,831.26
  5. Step 5: Solve for x
    x = 374,098,831.26/17,638.60
  6. Step 6: Final answer
    x = 21,209.10

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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.