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Finding the Fourth Proportional to 128,441.31, 177,284.66 and 74,736.74

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Solution

The fourth proportional to 128,441.31, 177,284.66 and 74,736.74 is: 103,157.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,441.31 : 177,284.66 = 74,736.74 : x
  2. Step 2: Convert to fraction form
    128,441.31/177,284.66 = 74,736.74/x
  3. Step 3: Cross multiply
    128,441.31x = 177,284.66 × 74,736.74
  4. Step 4: Simplify right side
    128,441.31x = 13,249,676,653.99
  5. Step 5: Solve for x
    x = 13,249,676,653.99/128,441.31
  6. Step 6: Final answer
    x = 103,157.44

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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.