Home / 129,140.28-178,228.08-78,181.14

Finding the Fourth Proportional to 129,140.28, 178,228.08 and 78,181.14

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Solution

The fourth proportional to 129,140.28, 178,228.08 and 78,181.14 is: 107,898.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,140.28 : 178,228.08 = 78,181.14 : x
  2. Step 2: Convert to fraction form
    129,140.28/178,228.08 = 78,181.14/x
  3. Step 3: Cross multiply
    129,140.28x = 178,228.08 × 78,181.14
  4. Step 4: Simplify right side
    129,140.28x = 13,934,074,474.41
  5. Step 5: Solve for x
    x = 13,934,074,474.41/129,140.28
  6. Step 6: Final answer
    x = 107,898.75

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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.