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Finding the Fourth Proportional to 136,685.40, 205,085.70 and 74,400.60

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Solution

The fourth proportional to 136,685.40, 205,085.70 and 74,400.60 is: 111,632.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,685.40 : 205,085.70 = 74,400.60 : x
  2. Step 2: Convert to fraction form
    136,685.40/205,085.70 = 74,400.60/x
  3. Step 3: Cross multiply
    136,685.40x = 205,085.70 × 74,400.60
  4. Step 4: Simplify right side
    136,685.40x = 15,258,499,131.42
  5. Step 5: Solve for x
    x = 15,258,499,131.42/136,685.40
  6. Step 6: Final answer
    x = 111,632.25

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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.