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Finding the Fourth Proportional to 28,480.64, 39,300.88 and 15,905.12

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Solution

The fourth proportional to 28,480.64, 39,300.88 and 15,905.12 is: 21,947.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,480.64 : 39,300.88 = 15,905.12 : x
  2. Step 2: Convert to fraction form
    28,480.64/39,300.88 = 15,905.12/x
  3. Step 3: Cross multiply
    28,480.64x = 39,300.88 × 15,905.12
  4. Step 4: Simplify right side
    28,480.64x = 625,085,212.51
  5. Step 5: Solve for x
    x = 625,085,212.51/28,480.64
  6. Step 6: Final answer
    x = 21,947.72

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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.