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Finding the Fourth Proportional to 128,506.60, 192,661.08 and 65,274.76

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Solution

The fourth proportional to 128,506.60, 192,661.08 and 65,274.76 is: 97,861.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,506.60 : 192,661.08 = 65,274.76 : x
  2. Step 2: Convert to fraction form
    128,506.60/192,661.08 = 65,274.76/x
  3. Step 3: Cross multiply
    128,506.60x = 192,661.08 × 65,274.76
  4. Step 4: Simplify right side
    128,506.60x = 12,575,905,758.34
  5. Step 5: Solve for x
    x = 12,575,905,758.34/128,506.60
  6. Step 6: Final answer
    x = 97,861.94

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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.