Home / 12,920.31-19,381.14-4,155.30

Finding the Fourth Proportional to 12,920.31, 19,381.14 and 4,155.30

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Solution

The fourth proportional to 12,920.31, 19,381.14 and 4,155.30 is: 6,233.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920.31 : 19,381.14 = 4,155.30 : x
  2. Step 2: Convert to fraction form
    12,920.31/19,381.14 = 4,155.30/x
  3. Step 3: Cross multiply
    12,920.31x = 19,381.14 × 4,155.30
  4. Step 4: Simplify right side
    12,920.31x = 80,534,451.04
  5. Step 5: Solve for x
    x = 80,534,451.04/12,920.31
  6. Step 6: Final answer
    x = 6,233.17

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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.