Home / 12,980.80-19,442.40-8,315.20

Finding the Fourth Proportional to 12,980.80, 19,442.40 and 8,315.20

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Solution

The fourth proportional to 12,980.80, 19,442.40 and 8,315.20 is: 12,454.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,980.80 : 19,442.40 = 8,315.20 : x
  2. Step 2: Convert to fraction form
    12,980.80/19,442.40 = 8,315.20/x
  3. Step 3: Cross multiply
    12,980.80x = 19,442.40 × 8,315.20
  4. Step 4: Simplify right side
    12,980.80x = 161,667,444.48
  5. Step 5: Solve for x
    x = 161,667,444.48/12,980.80
  6. Step 6: Final answer
    x = 12,454.35

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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.