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Finding the Fourth Proportional to 128,989.72, 193,539.66 and 69,756.04

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Solution

The fourth proportional to 128,989.72, 193,539.66 and 69,756.04 is: 104,663.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.72 : 193,539.66 = 69,756.04 : x
  2. Step 2: Convert to fraction form
    128,989.72/193,539.66 = 69,756.04/x
  3. Step 3: Cross multiply
    128,989.72x = 193,539.66 × 69,756.04
  4. Step 4: Simplify right side
    128,989.72x = 13,500,560,264.55
  5. Step 5: Solve for x
    x = 13,500,560,264.55/128,989.72
  6. Step 6: Final answer
    x = 104,663.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.