Home / 142,098.10-196,081.40-78,431.78

Finding the Fourth Proportional to 142,098.10, 196,081.40 and 78,431.78

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Solution

The fourth proportional to 142,098.10, 196,081.40 and 78,431.78 is: 108,228.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,098.10 : 196,081.40 = 78,431.78 : x
  2. Step 2: Convert to fraction form
    142,098.10/196,081.40 = 78,431.78/x
  3. Step 3: Cross multiply
    142,098.10x = 196,081.40 × 78,431.78
  4. Step 4: Simplify right side
    142,098.10x = 15,379,013,226.89
  5. Step 5: Solve for x
    x = 15,379,013,226.89/142,098.10
  6. Step 6: Final answer
    x = 108,228.14

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1.5x scale

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.