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Finding the Fourth Proportional to 138,026.40, 207,068.40 and 78,813.60

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Solution

The fourth proportional to 138,026.40, 207,068.40 and 78,813.60 is: 118,236.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,026.40 : 207,068.40 = 78,813.60 : x
  2. Step 2: Convert to fraction form
    138,026.40/207,068.40 = 78,813.60/x
  3. Step 3: Cross multiply
    138,026.40x = 207,068.40 × 78,813.60
  4. Step 4: Simplify right side
    138,026.40x = 16,319,806,050.24
  5. Step 5: Solve for x
    x = 16,319,806,050.24/138,026.40
  6. Step 6: Final answer
    x = 118,236.84

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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.