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Finding the Fourth Proportional to 128,690.68, 177,599.70 and 71,336.10

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Solution

The fourth proportional to 128,690.68, 177,599.70 and 71,336.10 is: 98,447.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,690.68 : 177,599.70 = 71,336.10 : x
  2. Step 2: Convert to fraction form
    128,690.68/177,599.70 = 71,336.10/x
  3. Step 3: Cross multiply
    128,690.68x = 177,599.70 × 71,336.10
  4. Step 4: Simplify right side
    128,690.68x = 12,669,269,959.17
  5. Step 5: Solve for x
    x = 12,669,269,959.17/128,690.68
  6. Step 6: Final answer
    x = 98,447.46

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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.