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Finding the Fourth Proportional to 28,377, 39,159.90 and 15,630.84

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Solution

The fourth proportional to 28,377, 39,159.90 and 15,630.84 is: 21,570.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,377 : 39,159.90 = 15,630.84 : x
  2. Step 2: Convert to fraction form
    28,377/39,159.90 = 15,630.84/x
  3. Step 3: Cross multiply
    28,377x = 39,159.90 × 15,630.84
  4. Step 4: Simplify right side
    28,377x = 612,102,131.32
  5. Step 5: Solve for x
    x = 612,102,131.32/28,377
  6. Step 6: Final answer
    x = 21,570.36

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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.