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Finding the Fourth Proportional to 128,885.40, 193,272.84 and 69,705

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Solution

The fourth proportional to 128,885.40, 193,272.84 and 69,705 is: 104,527.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,885.40 : 193,272.84 = 69,705 : x
  2. Step 2: Convert to fraction form
    128,885.40/193,272.84 = 69,705/x
  3. Step 3: Cross multiply
    128,885.40x = 193,272.84 × 69,705
  4. Step 4: Simplify right side
    128,885.40x = 13,472,083,312.20
  5. Step 5: Solve for x
    x = 13,472,083,312.20/128,885.40
  6. Step 6: Final answer
    x = 104,527.61

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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.