Home / 15,493.90-21,381.50-8,420.26

Finding the Fourth Proportional to 15,493.90, 21,381.50 and 8,420.26

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Solution

The fourth proportional to 15,493.90, 21,381.50 and 8,420.26 is: 11,619.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,493.90 : 21,381.50 = 8,420.26 : x
  2. Step 2: Convert to fraction form
    15,493.90/21,381.50 = 8,420.26/x
  3. Step 3: Cross multiply
    15,493.90x = 21,381.50 × 8,420.26
  4. Step 4: Simplify right side
    15,493.90x = 180,037,789.19
  5. Step 5: Solve for x
    x = 180,037,789.19/15,493.90
  6. Step 6: Final answer
    x = 11,619.91

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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.