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Finding the Fourth Proportional to 78,200.70, 107,917.11 and 42,390.60

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Solution

The fourth proportional to 78,200.70, 107,917.11 and 42,390.60 is: 58,499.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,200.70 : 107,917.11 = 42,390.60 : x
  2. Step 2: Convert to fraction form
    78,200.70/107,917.11 = 42,390.60/x
  3. Step 3: Cross multiply
    78,200.70x = 107,917.11 × 42,390.60
  4. Step 4: Simplify right side
    78,200.70x = 4,574,671,043.17
  5. Step 5: Solve for x
    x = 4,574,671,043.17/78,200.70
  6. Step 6: Final answer
    x = 58,499.11

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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.