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Finding the Fourth Proportional to 111,989.38, 154,545.34 and 61,688.38

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Solution

The fourth proportional to 111,989.38, 154,545.34 and 61,688.38 is: 85,129.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,989.38 : 154,545.34 = 61,688.38 : x
  2. Step 2: Convert to fraction form
    111,989.38/154,545.34 = 61,688.38/x
  3. Step 3: Cross multiply
    111,989.38x = 154,545.34 × 61,688.38
  4. Step 4: Simplify right side
    111,989.38x = 9,533,650,888.42
  5. Step 5: Solve for x
    x = 9,533,650,888.42/111,989.38
  6. Step 6: Final answer
    x = 85,129.96

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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.