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Finding the Fourth Proportional to 28,409.64, 39,207.04 and 15,662.82

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Solution

The fourth proportional to 28,409.64, 39,207.04 and 15,662.82 is: 21,615.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,409.64 : 39,207.04 = 15,662.82 : x
  2. Step 2: Convert to fraction form
    28,409.64/39,207.04 = 15,662.82/x
  3. Step 3: Cross multiply
    28,409.64x = 39,207.04 × 15,662.82
  4. Step 4: Simplify right side
    28,409.64x = 614,092,810.25
  5. Step 5: Solve for x
    x = 614,092,810.25/28,409.64
  6. Step 6: Final answer
    x = 21,615.65

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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.