Home / 142,345.30-196,428.07-78,679.30

Finding the Fourth Proportional to 142,345.30, 196,428.07 and 78,679.30

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Solution

The fourth proportional to 142,345.30, 196,428.07 and 78,679.30 is: 108,572.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,345.30 : 196,428.07 = 78,679.30 : x
  2. Step 2: Convert to fraction form
    142,345.30/196,428.07 = 78,679.30/x
  3. Step 3: Cross multiply
    142,345.30x = 196,428.07 × 78,679.30
  4. Step 4: Simplify right side
    142,345.30x = 15,454,823,047.95
  5. Step 5: Solve for x
    x = 15,454,823,047.95/142,345.30
  6. Step 6: Final answer
    x = 108,572.77

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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.