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Finding the Fourth Proportional to 85,128.72, 117,485.80 and 47,402.96

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Solution

The fourth proportional to 85,128.72, 117,485.80 and 47,402.96 is: 65,420.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,128.72 : 117,485.80 = 47,402.96 : x
  2. Step 2: Convert to fraction form
    85,128.72/117,485.80 = 47,402.96/x
  3. Step 3: Cross multiply
    85,128.72x = 117,485.80 × 47,402.96
  4. Step 4: Simplify right side
    85,128.72x = 5,569,174,677.97
  5. Step 5: Solve for x
    x = 5,569,174,677.97/85,128.72
  6. Step 6: Final answer
    x = 65,420.63

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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.