Home / 21,123.02-29,142.65-12,170.30

Finding the Fourth Proportional to 21,123.02, 29,142.65 and 12,170.30

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Solution

The fourth proportional to 21,123.02, 29,142.65 and 12,170.30 is: 16,790.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.02 : 29,142.65 = 12,170.30 : x
  2. Step 2: Convert to fraction form
    21,123.02/29,142.65 = 12,170.30/x
  3. Step 3: Cross multiply
    21,123.02x = 29,142.65 × 12,170.30
  4. Step 4: Simplify right side
    21,123.02x = 354,674,793.30
  5. Step 5: Solve for x
    x = 354,674,793.30/21,123.02
  6. Step 6: Final answer
    x = 16,790.91

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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.