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Finding the Fourth Proportional to 85,130.72, 117,479.04 and 47,405.60

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Solution

The fourth proportional to 85,130.72, 117,479.04 and 47,405.60 is: 65,418.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,130.72 : 117,479.04 = 47,405.60 : x
  2. Step 2: Convert to fraction form
    85,130.72/117,479.04 = 47,405.60/x
  3. Step 3: Cross multiply
    85,130.72x = 117,479.04 × 47,405.60
  4. Step 4: Simplify right side
    85,130.72x = 5,569,164,378.62
  5. Step 5: Solve for x
    x = 5,569,164,378.62/85,130.72
  6. Step 6: Final answer
    x = 65,418.97

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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.