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Finding the Fourth Proportional to 85,627.70, 128,492.28 and 47,708.72

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Solution

The fourth proportional to 85,627.70, 128,492.28 and 47,708.72 is: 71,591.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,627.70 : 128,492.28 = 47,708.72 : x
  2. Step 2: Convert to fraction form
    85,627.70/128,492.28 = 47,708.72/x
  3. Step 3: Cross multiply
    85,627.70x = 128,492.28 × 47,708.72
  4. Step 4: Simplify right side
    85,627.70x = 6,130,202,208.68
  5. Step 5: Solve for x
    x = 6,130,202,208.68/85,627.70
  6. Step 6: Final answer
    x = 71,591.34

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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.