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Finding the Fourth Proportional to 19,638.40, 29,465.70 and 18,087.40

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Solution

The fourth proportional to 19,638.40, 29,465.70 and 18,087.40 is: 27,138.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,638.40 : 29,465.70 = 18,087.40 : x
  2. Step 2: Convert to fraction form
    19,638.40/29,465.70 = 18,087.40/x
  3. Step 3: Cross multiply
    19,638.40x = 29,465.70 × 18,087.40
  4. Step 4: Simplify right side
    19,638.40x = 532,957,902.18
  5. Step 5: Solve for x
    x = 532,957,902.18/19,638.40
  6. Step 6: Final answer
    x = 27,138.56

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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.