Home / 15,490.98-21,378.96-8,778.77

Finding the Fourth Proportional to 15,490.98, 21,378.96 and 8,778.77

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Solution

The fourth proportional to 15,490.98, 21,378.96 and 8,778.77 is: 12,115.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,490.98 : 21,378.96 = 8,778.77 : x
  2. Step 2: Convert to fraction form
    15,490.98/21,378.96 = 8,778.77/x
  3. Step 3: Cross multiply
    15,490.98x = 21,378.96 × 8,778.77
  4. Step 4: Simplify right side
    15,490.98x = 187,680,972.68
  5. Step 5: Solve for x
    x = 187,680,972.68/15,490.98
  6. Step 6: Final answer
    x = 12,115.50

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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.