Home / 20,280.80-30,420.96-7,133.12

Finding the Fourth Proportional to 20,280.80, 30,420.96 and 7,133.12

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Solution

The fourth proportional to 20,280.80, 30,420.96 and 7,133.12 is: 10,699.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.80 : 30,420.96 = 7,133.12 : x
  2. Step 2: Convert to fraction form
    20,280.80/30,420.96 = 7,133.12/x
  3. Step 3: Cross multiply
    20,280.80x = 30,420.96 × 7,133.12
  4. Step 4: Simplify right side
    20,280.80x = 216,996,358.20
  5. Step 5: Solve for x
    x = 216,996,358.20/20,280.80
  6. Step 6: Final answer
    x = 10,699.60

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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.