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Finding the Fourth Proportional to 205,415.60, 308,123.40 and 138,930.80

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Solution

The fourth proportional to 205,415.60, 308,123.40 and 138,930.80 is: 208,396.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,415.60 : 308,123.40 = 138,930.80 : x
  2. Step 2: Convert to fraction form
    205,415.60/308,123.40 = 138,930.80/x
  3. Step 3: Cross multiply
    205,415.60x = 308,123.40 × 138,930.80
  4. Step 4: Simplify right side
    205,415.60x = 42,807,830,460.72
  5. Step 5: Solve for x
    x = 42,807,830,460.72/205,415.60
  6. Step 6: Final answer
    x = 208,396.20

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1.5x scale

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.