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Finding the Fourth Proportional to 18,915.63, 28,373.90 and 4,876.00

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Solution

The fourth proportional to 18,915.63, 28,373.90 and 4,876.00 is: 7,314.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.63 : 28,373.90 = 4,876.00 : x
  2. Step 2: Convert to fraction form
    18,915.63/28,373.90 = 4,876.00/x
  3. Step 3: Cross multiply
    18,915.63x = 28,373.90 × 4,876.00
  4. Step 4: Simplify right side
    18,915.63x = 138,351,041.09
  5. Step 5: Solve for x
    x = 138,351,041.09/18,915.63
  6. Step 6: Final answer
    x = 7,314.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.