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Finding the Fourth Proportional to 129,494.81, 178,804.19 and 101,280.89

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Solution

The fourth proportional to 129,494.81, 178,804.19 and 101,280.89 is: 139,846.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,494.81 : 178,804.19 = 101,280.89 : x
  2. Step 2: Convert to fraction form
    129,494.81/178,804.19 = 101,280.89/x
  3. Step 3: Cross multiply
    129,494.81x = 178,804.19 × 101,280.89
  4. Step 4: Simplify right side
    129,494.81x = 18,109,447,498.93
  5. Step 5: Solve for x
    x = 18,109,447,498.93/129,494.81
  6. Step 6: Final answer
    x = 139,846.90

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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.