Home / 142,129.72-196,139.62-78,468.04

Finding the Fourth Proportional to 142,129.72, 196,139.62 and 78,468.04

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Solution

The fourth proportional to 142,129.72, 196,139.62 and 78,468.04 is: 108,286.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,129.72 : 196,139.62 = 78,468.04 : x
  2. Step 2: Convert to fraction form
    142,129.72/196,139.62 = 78,468.04/x
  3. Step 3: Cross multiply
    142,129.72x = 196,139.62 × 78,468.04
  4. Step 4: Simplify right side
    142,129.72x = 15,390,691,547.74
  5. Step 5: Solve for x
    x = 15,390,691,547.74/142,129.72
  6. Step 6: Final answer
    x = 108,286.23

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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.