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Finding the Fourth Proportional to 68,211.10, 102,316.65 and 28,812.70

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Solution

The fourth proportional to 68,211.10, 102,316.65 and 28,812.70 is: 43,219.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,211.10 : 102,316.65 = 28,812.70 : x
  2. Step 2: Convert to fraction form
    68,211.10/102,316.65 = 28,812.70/x
  3. Step 3: Cross multiply
    68,211.10x = 102,316.65 × 28,812.70
  4. Step 4: Simplify right side
    68,211.10x = 2,948,018,941.46
  5. Step 5: Solve for x
    x = 2,948,018,941.46/68,211.10
  6. Step 6: Final answer
    x = 43,219.05

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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.