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Finding the Fourth Proportional to 28,486.42, 39,311.88 and 15,911.20

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Solution

The fourth proportional to 28,486.42, 39,311.88 and 15,911.20 is: 21,957.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,486.42 : 39,311.88 = 15,911.20 : x
  2. Step 2: Convert to fraction form
    28,486.42/39,311.88 = 15,911.20/x
  3. Step 3: Cross multiply
    28,486.42x = 39,311.88 × 15,911.20
  4. Step 4: Simplify right side
    28,486.42x = 625,499,185.06
  5. Step 5: Solve for x
    x = 625,499,185.06/28,486.42
  6. Step 6: Final answer
    x = 21,957.80

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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.