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Finding the Fourth Proportional to 230,954.02, 318,713.18 and 128,978.40

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Solution

The fourth proportional to 230,954.02, 318,713.18 and 128,978.40 is: 177,988.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,954.02 : 318,713.18 = 128,978.40 : x
  2. Step 2: Convert to fraction form
    230,954.02/318,713.18 = 128,978.40/x
  3. Step 3: Cross multiply
    230,954.02x = 318,713.18 × 128,978.40
  4. Step 4: Simplify right side
    230,954.02x = 41,107,116,015.31
  5. Step 5: Solve for x
    x = 41,107,116,015.31/230,954.02
  6. Step 6: Final answer
    x = 177,988.31

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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.