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Finding the Fourth Proportional to 76,858.54, 106,065.40 and 42,865.90

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Solution

The fourth proportional to 76,858.54, 106,065.40 and 42,865.90 is: 59,155.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,858.54 : 106,065.40 = 42,865.90 : x
  2. Step 2: Convert to fraction form
    76,858.54/106,065.40 = 42,865.90/x
  3. Step 3: Cross multiply
    76,858.54x = 106,065.40 × 42,865.90
  4. Step 4: Simplify right side
    76,858.54x = 4,546,588,829.86
  5. Step 5: Solve for x
    x = 4,546,588,829.86/76,858.54
  6. Step 6: Final answer
    x = 59,155.28

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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.