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Finding the Fourth Proportional to 28,251.90, 38,987.37 and 15,504.71

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Solution

The fourth proportional to 28,251.90, 38,987.37 and 15,504.71 is: 21,396.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,251.90 : 38,987.37 = 15,504.71 : x
  2. Step 2: Convert to fraction form
    28,251.90/38,987.37 = 15,504.71/x
  3. Step 3: Cross multiply
    28,251.90x = 38,987.37 × 15,504.71
  4. Step 4: Simplify right side
    28,251.90x = 604,487,670.58
  5. Step 5: Solve for x
    x = 604,487,670.58/28,251.90
  6. Step 6: Final answer
    x = 21,396.35

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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.