Home / 15,494.28-21,381.53-8,420.55

Finding the Fourth Proportional to 15,494.28, 21,381.53 and 8,420.55

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Solution

The fourth proportional to 15,494.28, 21,381.53 and 8,420.55 is: 11,620.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,494.28 : 21,381.53 = 8,420.55 : x
  2. Step 2: Convert to fraction form
    15,494.28/21,381.53 = 8,420.55/x
  3. Step 3: Cross multiply
    15,494.28x = 21,381.53 × 8,420.55
  4. Step 4: Simplify right side
    15,494.28x = 180,044,200.34
  5. Step 5: Solve for x
    x = 180,044,200.34/15,494.28
  6. Step 6: Final answer
    x = 11,620.04

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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.