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Finding the Fourth Proportional to 12,890.85, 19,417.29 and 11,728.32

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Solution

The fourth proportional to 12,890.85, 19,417.29 and 11,728.32 is: 17,666.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.85 : 19,417.29 = 11,728.32 : x
  2. Step 2: Convert to fraction form
    12,890.85/19,417.29 = 11,728.32/x
  3. Step 3: Cross multiply
    12,890.85x = 19,417.29 × 11,728.32
  4. Step 4: Simplify right side
    12,890.85x = 227,732,190.65
  5. Step 5: Solve for x
    x = 227,732,190.65/12,890.85
  6. Step 6: Final answer
    x = 17,666.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.