Home / 12,979.20-19,420.20-8,605.20

Finding the Fourth Proportional to 12,979.20, 19,420.20 and 8,605.20

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Solution

The fourth proportional to 12,979.20, 19,420.20 and 8,605.20 is: 12,875.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.20 : 19,420.20 = 8,605.20 : x
  2. Step 2: Convert to fraction form
    12,979.20/19,420.20 = 8,605.20/x
  3. Step 3: Cross multiply
    12,979.20x = 19,420.20 × 8,605.20
  4. Step 4: Simplify right side
    12,979.20x = 167,114,705.04
  5. Step 5: Solve for x
    x = 167,114,705.04/12,979.20
  6. Step 6: Final answer
    x = 12,875.58

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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.