Home / 12,155.41-16,776.11-7,121.63

Finding the Fourth Proportional to 12,155.41, 16,776.11 and 7,121.63

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Solution

The fourth proportional to 12,155.41, 16,776.11 and 7,121.63 is: 9,828.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,155.41 : 16,776.11 = 7,121.63 : x
  2. Step 2: Convert to fraction form
    12,155.41/16,776.11 = 7,121.63/x
  3. Step 3: Cross multiply
    12,155.41x = 16,776.11 × 7,121.63
  4. Step 4: Simplify right side
    12,155.41x = 119,473,254.35
  5. Step 5: Solve for x
    x = 119,473,254.35/12,155.41
  6. Step 6: Final answer
    x = 9,828.82

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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.