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Finding the Fourth Proportional to 142,342.80, 196,424.62 and 78,676.80

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Solution

The fourth proportional to 142,342.80, 196,424.62 and 78,676.80 is: 108,569.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,342.80 : 196,424.62 = 78,676.80 : x
  2. Step 2: Convert to fraction form
    142,342.80/196,424.62 = 78,676.80/x
  3. Step 3: Cross multiply
    142,342.80x = 196,424.62 × 78,676.80
  4. Step 4: Simplify right side
    142,342.80x = 15,454,060,542.82
  5. Step 5: Solve for x
    x = 15,454,060,542.82/142,342.80
  6. Step 6: Final answer
    x = 108,569.32

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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.