Home / 13,281.20-19,921.80-8,615.60

Finding the Fourth Proportional to 13,281.20, 19,921.80 and 8,615.60

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Solution

The fourth proportional to 13,281.20, 19,921.80 and 8,615.60 is: 12,923.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,281.20 : 19,921.80 = 8,615.60 : x
  2. Step 2: Convert to fraction form
    13,281.20/19,921.80 = 8,615.60/x
  3. Step 3: Cross multiply
    13,281.20x = 19,921.80 × 8,615.60
  4. Step 4: Simplify right side
    13,281.20x = 171,638,260.08
  5. Step 5: Solve for x
    x = 171,638,260.08/13,281.20
  6. Step 6: Final answer
    x = 12,923.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.