Home / 20,528.96-30,781.14-9,978.22

Finding the Fourth Proportional to 20,528.96, 30,781.14 and 9,978.22

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Solution

The fourth proportional to 20,528.96, 30,781.14 and 9,978.22 is: 14,961.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,528.96 : 30,781.14 = 9,978.22 : x
  2. Step 2: Convert to fraction form
    20,528.96/30,781.14 = 9,978.22/x
  3. Step 3: Cross multiply
    20,528.96x = 30,781.14 × 9,978.22
  4. Step 4: Simplify right side
    20,528.96x = 307,140,986.77
  5. Step 5: Solve for x
    x = 307,140,986.77/20,528.96
  6. Step 6: Final answer
    x = 14,961.35

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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.