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Finding the Fourth Proportional to 15,378.60, 21,223.35 and 9,408.60

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Solution

The fourth proportional to 15,378.60, 21,223.35 and 9,408.60 is: 12,984.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,378.60 : 21,223.35 = 9,408.60 : x
  2. Step 2: Convert to fraction form
    15,378.60/21,223.35 = 9,408.60/x
  3. Step 3: Cross multiply
    15,378.60x = 21,223.35 × 9,408.60
  4. Step 4: Simplify right side
    15,378.60x = 199,682,010.81
  5. Step 5: Solve for x
    x = 199,682,010.81/15,378.60
  6. Step 6: Final answer
    x = 12,984.41

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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.