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Finding the Fourth Proportional to 18,722.79, 28,084.10 and 4,871.75

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Solution

The fourth proportional to 18,722.79, 28,084.10 and 4,871.75 is: 7,307.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.79 : 28,084.10 = 4,871.75 : x
  2. Step 2: Convert to fraction form
    18,722.79/28,084.10 = 4,871.75/x
  3. Step 3: Cross multiply
    18,722.79x = 28,084.10 × 4,871.75
  4. Step 4: Simplify right side
    18,722.79x = 136,818,714.18
  5. Step 5: Solve for x
    x = 136,818,714.18/18,722.79
  6. Step 6: Final answer
    x = 7,307.60

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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.