Home / 142,438.71-196,564.28-78,774.87

Finding the Fourth Proportional to 142,438.71, 196,564.28 and 78,774.87

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Solution

The fourth proportional to 142,438.71, 196,564.28 and 78,774.87 is: 108,708.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,438.71 : 196,564.28 = 78,774.87 : x
  2. Step 2: Convert to fraction form
    142,438.71/196,564.28 = 78,774.87/x
  3. Step 3: Cross multiply
    142,438.71x = 196,564.28 × 78,774.87
  4. Step 4: Simplify right side
    142,438.71x = 15,484,325,209.77
  5. Step 5: Solve for x
    x = 15,484,325,209.77/142,438.71
  6. Step 6: Final answer
    x = 108,708.69

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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.