Home / 13,615.02-18,774.90-12,821.30

Finding the Fourth Proportional to 13,615.02, 18,774.90 and 12,821.30

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Solution

The fourth proportional to 13,615.02, 18,774.90 and 12,821.30 is: 17,680.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.02 : 18,774.90 = 12,821.30 : x
  2. Step 2: Convert to fraction form
    13,615.02/18,774.90 = 12,821.30/x
  3. Step 3: Cross multiply
    13,615.02x = 18,774.90 × 12,821.30
  4. Step 4: Simplify right side
    13,615.02x = 240,718,625.37
  5. Step 5: Solve for x
    x = 240,718,625.37/13,615.02
  6. Step 6: Final answer
    x = 17,680.37

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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.