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Finding the Fourth Proportional to 136,605.20, 204,907.80 and 91,990.40

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Solution

The fourth proportional to 136,605.20, 204,907.80 and 91,990.40 is: 137,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,605.20 : 204,907.80 = 91,990.40 : x
  2. Step 2: Convert to fraction form
    136,605.20/204,907.80 = 91,990.40/x
  3. Step 3: Cross multiply
    136,605.20x = 204,907.80 × 91,990.40
  4. Step 4: Simplify right side
    136,605.20x = 18,849,550,485.12
  5. Step 5: Solve for x
    x = 18,849,550,485.12/136,605.20
  6. Step 6: Final answer
    x = 137,985.60

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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.