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Finding the Fourth Proportional to 18,887, 28,440.71 and 13,991.36

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Solution

The fourth proportional to 18,887, 28,440.71 and 13,991.36 is: 21,068.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,887 : 28,440.71 = 13,991.36 : x
  2. Step 2: Convert to fraction form
    18,887/28,440.71 = 13,991.36/x
  3. Step 3: Cross multiply
    18,887x = 28,440.71 × 13,991.36
  4. Step 4: Simplify right side
    18,887x = 397,924,212.27
  5. Step 5: Solve for x
    x = 397,924,212.27/18,887
  6. Step 6: Final answer
    x = 21,068.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.