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Finding the Fourth Proportional to 13,487.78, 20,240.78 and 4,722.77

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Solution

The fourth proportional to 13,487.78, 20,240.78 and 4,722.77 is: 7,087.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,487.78 : 20,240.78 = 4,722.77 : x
  2. Step 2: Convert to fraction form
    13,487.78/20,240.78 = 4,722.77/x
  3. Step 3: Cross multiply
    13,487.78x = 20,240.78 × 4,722.77
  4. Step 4: Simplify right side
    13,487.78x = 95,592,575.55
  5. Step 5: Solve for x
    x = 95,592,575.55/13,487.78
  6. Step 6: Final answer
    x = 7,087.35

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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.