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Finding the Fourth Proportional to 129,365.77, 178,459.44 and 75,615.67

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Solution

The fourth proportional to 129,365.77, 178,459.44 and 75,615.67 is: 104,311.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,365.77 : 178,459.44 = 75,615.67 : x
  2. Step 2: Convert to fraction form
    129,365.77/178,459.44 = 75,615.67/x
  3. Step 3: Cross multiply
    129,365.77x = 178,459.44 × 75,615.67
  4. Step 4: Simplify right side
    129,365.77x = 13,494,330,123.42
  5. Step 5: Solve for x
    x = 13,494,330,123.42/129,365.77
  6. Step 6: Final answer
    x = 104,311.44

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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.