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Finding the Fourth Proportional to 78,213.76, 107,935.77 and 42,403.69

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Solution

The fourth proportional to 78,213.76, 107,935.77 and 42,403.69 is: 58,517.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,213.76 : 107,935.77 = 42,403.69 : x
  2. Step 2: Convert to fraction form
    78,213.76/107,935.77 = 42,403.69/x
  3. Step 3: Cross multiply
    78,213.76x = 107,935.77 × 42,403.69
  4. Step 4: Simplify right side
    78,213.76x = 4,576,874,930.99
  5. Step 5: Solve for x
    x = 4,576,874,930.99/78,213.76
  6. Step 6: Final answer
    x = 58,517.52

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1.5x scale

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.