Home / 12,421.20-17,140.07-7,115.30

Finding the Fourth Proportional to 12,421.20, 17,140.07 and 7,115.30

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Solution

The fourth proportional to 12,421.20, 17,140.07 and 7,115.30 is: 9,818.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,421.20 : 17,140.07 = 7,115.30 : x
  2. Step 2: Convert to fraction form
    12,421.20/17,140.07 = 7,115.30/x
  3. Step 3: Cross multiply
    12,421.20x = 17,140.07 × 7,115.30
  4. Step 4: Simplify right side
    12,421.20x = 121,956,740.07
  5. Step 5: Solve for x
    x = 121,956,740.07/12,421.20
  6. Step 6: Final answer
    x = 9,818.43

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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.