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Finding the Fourth Proportional to 21,339.40, 32,009.10 and 18,747.40

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Solution

The fourth proportional to 21,339.40, 32,009.10 and 18,747.40 is: 28,121.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,339.40 : 32,009.10 = 18,747.40 : x
  2. Step 2: Convert to fraction form
    21,339.40/32,009.10 = 18,747.40/x
  3. Step 3: Cross multiply
    21,339.40x = 32,009.10 × 18,747.40
  4. Step 4: Simplify right side
    21,339.40x = 600,087,401.34
  5. Step 5: Solve for x
    x = 600,087,401.34/21,339.40
  6. Step 6: Final answer
    x = 28,121.10

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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.