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Finding the Fourth Proportional to 85,885.72, 128,865.66 and 46,470.60

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Solution

The fourth proportional to 85,885.72, 128,865.66 and 46,470.60 is: 69,725.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,885.72 : 128,865.66 = 46,470.60 : x
  2. Step 2: Convert to fraction form
    85,885.72/128,865.66 = 46,470.60/x
  3. Step 3: Cross multiply
    85,885.72x = 128,865.66 × 46,470.60
  4. Step 4: Simplify right side
    85,885.72x = 5,988,464,539.60
  5. Step 5: Solve for x
    x = 5,988,464,539.60/85,885.72
  6. Step 6: Final answer
    x = 69,725.96

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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.