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Finding the Fourth Proportional to 20,401.20, 30,587.40 and 7,916.40

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Solution

The fourth proportional to 20,401.20, 30,587.40 and 7,916.40 is: 11,869.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,401.20 : 30,587.40 = 7,916.40 : x
  2. Step 2: Convert to fraction form
    20,401.20/30,587.40 = 7,916.40/x
  3. Step 3: Cross multiply
    20,401.20x = 30,587.40 × 7,916.40
  4. Step 4: Simplify right side
    20,401.20x = 242,142,093.36
  5. Step 5: Solve for x
    x = 242,142,093.36/20,401.20
  6. Step 6: Final answer
    x = 11,869.01

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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.