Home / 12,420.12-17,139.60-7,114.80

Finding the Fourth Proportional to 12,420.12, 17,139.60 and 7,114.80

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Solution

The fourth proportional to 12,420.12, 17,139.60 and 7,114.80 is: 9,818.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.12 : 17,139.60 = 7,114.80 : x
  2. Step 2: Convert to fraction form
    12,420.12/17,139.60 = 7,114.80/x
  3. Step 3: Cross multiply
    12,420.12x = 17,139.60 × 7,114.80
  4. Step 4: Simplify right side
    12,420.12x = 121,944,826.08
  5. Step 5: Solve for x
    x = 121,944,826.08/12,420.12
  6. Step 6: Final answer
    x = 9,818.33

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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.