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Finding the Fourth Proportional to 128,775.65, 177,703.13 and 75,069.41

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Solution

The fourth proportional to 128,775.65, 177,703.13 and 75,069.41 is: 103,591.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,775.65 : 177,703.13 = 75,069.41 : x
  2. Step 2: Convert to fraction form
    128,775.65/177,703.13 = 75,069.41/x
  3. Step 3: Cross multiply
    128,775.65x = 177,703.13 × 75,069.41
  4. Step 4: Simplify right side
    128,775.65x = 13,340,068,423.41
  5. Step 5: Solve for x
    x = 13,340,068,423.41/128,775.65
  6. Step 6: Final answer
    x = 103,591.55

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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.