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Finding the Fourth Proportional to 100,912.72, 139,114.08 and 70,604.14

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Solution

The fourth proportional to 100,912.72, 139,114.08 and 70,604.14 is: 97,331.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,912.72 : 139,114.08 = 70,604.14 : x
  2. Step 2: Convert to fraction form
    100,912.72/139,114.08 = 70,604.14/x
  3. Step 3: Cross multiply
    100,912.72x = 139,114.08 × 70,604.14
  4. Step 4: Simplify right side
    100,912.72x = 9,822,029,980.29
  5. Step 5: Solve for x
    x = 9,822,029,980.29/100,912.72
  6. Step 6: Final answer
    x = 97,331.93

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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.