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Finding the Fourth Proportional to 100,953.72, 139,322.30 and 55,631.70

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Solution

The fourth proportional to 100,953.72, 139,322.30 and 55,631.70 is: 76,775.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,953.72 : 139,322.30 = 55,631.70 : x
  2. Step 2: Convert to fraction form
    100,953.72/139,322.30 = 55,631.70/x
  3. Step 3: Cross multiply
    100,953.72x = 139,322.30 × 55,631.70
  4. Step 4: Simplify right side
    100,953.72x = 7,750,736,396.91
  5. Step 5: Solve for x
    x = 7,750,736,396.91/100,953.72
  6. Step 6: Final answer
    x = 76,775.14

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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.