Home / 20,756.80-28,699.68-18,132.40

Finding the Fourth Proportional to 20,756.80, 28,699.68 and 18,132.40

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Solution

The fourth proportional to 20,756.80, 28,699.68 and 18,132.40 is: 25,071.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,756.80 : 28,699.68 = 18,132.40 : x
  2. Step 2: Convert to fraction form
    20,756.80/28,699.68 = 18,132.40/x
  3. Step 3: Cross multiply
    20,756.80x = 28,699.68 × 18,132.40
  4. Step 4: Simplify right side
    20,756.80x = 520,394,077.63
  5. Step 5: Solve for x
    x = 520,394,077.63/20,756.80
  6. Step 6: Final answer
    x = 25,071.02

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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.