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Finding the Fourth Proportional to 100,191.76, 138,264.64 and 55,479.76

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Solution

The fourth proportional to 100,191.76, 138,264.64 and 55,479.76 is: 76,562.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,191.76 : 138,264.64 = 55,479.76 : x
  2. Step 2: Convert to fraction form
    100,191.76/138,264.64 = 55,479.76/x
  3. Step 3: Cross multiply
    100,191.76x = 138,264.64 × 55,479.76
  4. Step 4: Simplify right side
    100,191.76x = 7,670,889,043.69
  5. Step 5: Solve for x
    x = 7,670,889,043.69/100,191.76
  6. Step 6: Final answer
    x = 76,562.08

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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.