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Finding the Fourth Proportional to 19,445.99, 26,826.13 and 12,728.66

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Solution

The fourth proportional to 19,445.99, 26,826.13 and 12,728.66 is: 17,559.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,445.99 : 26,826.13 = 12,728.66 : x
  2. Step 2: Convert to fraction form
    19,445.99/26,826.13 = 12,728.66/x
  3. Step 3: Cross multiply
    19,445.99x = 26,826.13 × 12,728.66
  4. Step 4: Simplify right side
    19,445.99x = 341,460,687.89
  5. Step 5: Solve for x
    x = 341,460,687.89/19,445.99
  6. Step 6: Final answer
    x = 17,559.44

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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.