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Finding the Fourth Proportional to 15,862.66, 21,890.36 and 8,789.06

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Solution

The fourth proportional to 15,862.66, 21,890.36 and 8,789.06 is: 12,128.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,862.66 : 21,890.36 = 8,789.06 : x
  2. Step 2: Convert to fraction form
    15,862.66/21,890.36 = 8,789.06/x
  3. Step 3: Cross multiply
    15,862.66x = 21,890.36 × 8,789.06
  4. Step 4: Simplify right side
    15,862.66x = 192,395,687.46
  5. Step 5: Solve for x
    x = 192,395,687.46/15,862.66
  6. Step 6: Final answer
    x = 12,128.84

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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.