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Finding the Fourth Proportional to 189,406.18, 261,386.81 and 103,369.87

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Solution

The fourth proportional to 189,406.18, 261,386.81 and 103,369.87 is: 142,653.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,406.18 : 261,386.81 = 103,369.87 : x
  2. Step 2: Convert to fraction form
    189,406.18/261,386.81 = 103,369.87/x
  3. Step 3: Cross multiply
    189,406.18x = 261,386.81 × 103,369.87
  4. Step 4: Simplify right side
    189,406.18x = 27,019,520,569.41
  5. Step 5: Solve for x
    x = 27,019,520,569.41/189,406.18
  6. Step 6: Final answer
    x = 142,653.85

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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.