Home / 21,879.12-30,188.34-12,920.52

Finding the Fourth Proportional to 21,879.12, 30,188.34 and 12,920.52

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Solution

The fourth proportional to 21,879.12, 30,188.34 and 12,920.52 is: 17,827.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.12 : 30,188.34 = 12,920.52 : x
  2. Step 2: Convert to fraction form
    21,879.12/30,188.34 = 12,920.52/x
  3. Step 3: Cross multiply
    21,879.12x = 30,188.34 × 12,920.52
  4. Step 4: Simplify right side
    21,879.12x = 390,049,050.74
  5. Step 5: Solve for x
    x = 390,049,050.74/21,879.12
  6. Step 6: Final answer
    x = 17,827.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.