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Finding the Fourth Proportional to 230,705.67, 318,374.60 and 128,729.28

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Solution

The fourth proportional to 230,705.67, 318,374.60 and 128,729.28 is: 177,646.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,705.67 : 318,374.60 = 128,729.28 : x
  2. Step 2: Convert to fraction form
    230,705.67/318,374.60 = 128,729.28/x
  3. Step 3: Cross multiply
    230,705.67x = 318,374.60 × 128,729.28
  4. Step 4: Simplify right side
    230,705.67x = 40,984,133,028.29
  5. Step 5: Solve for x
    x = 40,984,133,028.29/230,705.67
  6. Step 6: Final answer
    x = 177,646.84

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1.5x scale

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.