Home / 21,123.41-29,156.80-12,176.90

Finding the Fourth Proportional to 21,123.41, 29,156.80 and 12,176.90

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Solution

The fourth proportional to 21,123.41, 29,156.80 and 12,176.90 is: 16,807.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.41 : 29,156.80 = 12,176.90 : x
  2. Step 2: Convert to fraction form
    21,123.41/29,156.80 = 12,176.90/x
  3. Step 3: Cross multiply
    21,123.41x = 29,156.80 × 12,176.90
  4. Step 4: Simplify right side
    21,123.41x = 355,039,437.92
  5. Step 5: Solve for x
    x = 355,039,437.92/21,123.41
  6. Step 6: Final answer
    x = 16,807.87

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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.