Home / 20,751.55-31,119.69-7,420.95

Finding the Fourth Proportional to 20,751.55, 31,119.69 and 7,420.95

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Solution

The fourth proportional to 20,751.55, 31,119.69 and 7,420.95 is: 11,128.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.55 : 31,119.69 = 7,420.95 : x
  2. Step 2: Convert to fraction form
    20,751.55/31,119.69 = 7,420.95/x
  3. Step 3: Cross multiply
    20,751.55x = 31,119.69 × 7,420.95
  4. Step 4: Simplify right side
    20,751.55x = 230,937,663.51
  5. Step 5: Solve for x
    x = 230,937,663.51/20,751.55
  6. Step 6: Final answer
    x = 11,128.69

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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.