Home / 125,639.28-188,478.36-78,217.83

Finding the Fourth Proportional to 125,639.28, 188,478.36 and 78,217.83

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Solution

The fourth proportional to 125,639.28, 188,478.36 and 78,217.83 is: 117,338.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,639.28 : 188,478.36 = 78,217.83 : x
  2. Step 2: Convert to fraction form
    125,639.28/188,478.36 = 78,217.83/x
  3. Step 3: Cross multiply
    125,639.28x = 188,478.36 × 78,217.83
  4. Step 4: Simplify right side
    125,639.28x = 14,742,368,321.16
  5. Step 5: Solve for x
    x = 14,742,368,321.16/125,639.28
  6. Step 6: Final answer
    x = 117,338.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.