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Finding the Fourth Proportional to 28,878.39, 39,852.15 and 15,630.39

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Solution

The fourth proportional to 28,878.39, 39,852.15 and 15,630.39 is: 21,569.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,878.39 : 39,852.15 = 15,630.39 : x
  2. Step 2: Convert to fraction form
    28,878.39/39,852.15 = 15,630.39/x
  3. Step 3: Cross multiply
    28,878.39x = 39,852.15 × 15,630.39
  4. Step 4: Simplify right side
    28,878.39x = 622,904,646.84
  5. Step 5: Solve for x
    x = 622,904,646.84/28,878.39
  6. Step 6: Final answer
    x = 21,569.92

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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.