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Finding the Fourth Proportional to 18,438.63, 27,607.53 and 12,897.51

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Solution

The fourth proportional to 18,438.63, 27,607.53 and 12,897.51 is: 19,311.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.63 : 27,607.53 = 12,897.51 : x
  2. Step 2: Convert to fraction form
    18,438.63/27,607.53 = 12,897.51/x
  3. Step 3: Cross multiply
    18,438.63x = 27,607.53 × 12,897.51
  4. Step 4: Simplify right side
    18,438.63x = 356,068,394.25
  5. Step 5: Solve for x
    x = 356,068,394.25/18,438.63
  6. Step 6: Final answer
    x = 19,311.00

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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.