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Finding the Fourth Proportional to 128,797.53, 177,742.07 and 71,438.00

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Solution

The fourth proportional to 128,797.53, 177,742.07 and 71,438.00 is: 98,585.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,797.53 : 177,742.07 = 71,438.00 : x
  2. Step 2: Convert to fraction form
    128,797.53/177,742.07 = 71,438.00/x
  3. Step 3: Cross multiply
    128,797.53x = 177,742.07 × 71,438.00
  4. Step 4: Simplify right side
    128,797.53x = 12,697,536,750.76
  5. Step 5: Solve for x
    x = 12,697,536,750.76/128,797.53
  6. Step 6: Final answer
    x = 98,585.25

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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.