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Finding the Fourth Proportional to 225,689.74, 311,461.38 and 128,909.52

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Solution

The fourth proportional to 225,689.74, 311,461.38 and 128,909.52 is: 177,900.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,689.74 : 311,461.38 = 128,909.52 : x
  2. Step 2: Convert to fraction form
    225,689.74/311,461.38 = 128,909.52/x
  3. Step 3: Cross multiply
    225,689.74x = 311,461.38 × 128,909.52
  4. Step 4: Simplify right side
    225,689.74x = 40,150,334,792.48
  5. Step 5: Solve for x
    x = 40,150,334,792.48/225,689.74
  6. Step 6: Final answer
    x = 177,900.58

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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.