Home / 15,408.10-21,304.65-13,439.80

Finding the Fourth Proportional to 15,408.10, 21,304.65 and 13,439.80

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Solution

The fourth proportional to 15,408.10, 21,304.65 and 13,439.80 is: 18,583.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,408.10 : 21,304.65 = 13,439.80 : x
  2. Step 2: Convert to fraction form
    15,408.10/21,304.65 = 13,439.80/x
  3. Step 3: Cross multiply
    15,408.10x = 21,304.65 × 13,439.80
  4. Step 4: Simplify right side
    15,408.10x = 286,330,235.07
  5. Step 5: Solve for x
    x = 286,330,235.07/15,408.10
  6. Step 6: Final answer
    x = 18,583.10

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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.