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Finding the Fourth Proportional to 102,958.40, 142,098.72 and 74,653.76

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Solution

The fourth proportional to 102,958.40, 142,098.72 and 74,653.76 is: 103,033.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,958.40 : 142,098.72 = 74,653.76 : x
  2. Step 2: Convert to fraction form
    102,958.40/142,098.72 = 74,653.76/x
  3. Step 3: Cross multiply
    102,958.40x = 142,098.72 × 74,653.76
  4. Step 4: Simplify right side
    102,958.40x = 10,608,203,739.19
  5. Step 5: Solve for x
    x = 10,608,203,739.19/102,958.40
  6. Step 6: Final answer
    x = 103,033.88

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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.