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Finding the Fourth Proportional to 28,160.64, 38,864.64 and 21,074.64

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Solution

The fourth proportional to 28,160.64, 38,864.64 and 21,074.64 is: 29,085.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,160.64 : 38,864.64 = 21,074.64 : x
  2. Step 2: Convert to fraction form
    28,160.64/38,864.64 = 21,074.64/x
  3. Step 3: Cross multiply
    28,160.64x = 38,864.64 × 21,074.64
  4. Step 4: Simplify right side
    28,160.64x = 819,058,296.73
  5. Step 5: Solve for x
    x = 819,058,296.73/28,160.64
  6. Step 6: Final answer
    x = 29,085.22

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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.