Home / 7,421.48-11,129.65-2,155.06

Finding the Fourth Proportional to 7,421.48, 11,129.65 and 2,155.06

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Solution

The fourth proportional to 7,421.48, 11,129.65 and 2,155.06 is: 3,231.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,421.48 : 11,129.65 = 2,155.06 : x
  2. Step 2: Convert to fraction form
    7,421.48/11,129.65 = 2,155.06/x
  3. Step 3: Cross multiply
    7,421.48x = 11,129.65 × 2,155.06
  4. Step 4: Simplify right side
    7,421.48x = 23,985,115.48
  5. Step 5: Solve for x
    x = 23,985,115.48/7,421.48
  6. Step 6: Final answer
    x = 3,231.85

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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.