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Finding the Fourth Proportional to 128,646.66, 177,619.14 and 80,322.24

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Solution

The fourth proportional to 128,646.66, 177,619.14 and 80,322.24 is: 110,898.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,646.66 : 177,619.14 = 80,322.24 : x
  2. Step 2: Convert to fraction form
    128,646.66/177,619.14 = 80,322.24/x
  3. Step 3: Cross multiply
    128,646.66x = 177,619.14 × 80,322.24
  4. Step 4: Simplify right side
    128,646.66x = 14,266,767,191.67
  5. Step 5: Solve for x
    x = 14,266,767,191.67/128,646.66
  6. Step 6: Final answer
    x = 110,898.85

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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.