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Finding the Fourth Proportional to 15,789.04, 21,789 and 8,619.01

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Solution

The fourth proportional to 15,789.04, 21,789 and 8,619.01 is: 11,894.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.04 : 21,789 = 8,619.01 : x
  2. Step 2: Convert to fraction form
    15,789.04/21,789 = 8,619.01/x
  3. Step 3: Cross multiply
    15,789.04x = 21,789 × 8,619.01
  4. Step 4: Simplify right side
    15,789.04x = 187,799,554.42
  5. Step 5: Solve for x
    x = 187,799,554.42/15,789.04
  6. Step 6: Final answer
    x = 11,894.30

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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.