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Finding the Fourth Proportional to 15,494.55, 21,381.87 and 8,420.82

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Solution

The fourth proportional to 15,494.55, 21,381.87 and 8,420.82 is: 11,620.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,494.55 : 21,381.87 = 8,420.82 : x
  2. Step 2: Convert to fraction form
    15,494.55/21,381.87 = 8,420.82/x
  3. Step 3: Cross multiply
    15,494.55x = 21,381.87 × 8,420.82
  4. Step 4: Simplify right side
    15,494.55x = 180,052,878.53
  5. Step 5: Solve for x
    x = 180,052,878.53/15,494.55
  6. Step 6: Final answer
    x = 11,620.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.