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Finding the Fourth Proportional to 398,765.64, 598,208.31 and 128,803.62

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Solution

The fourth proportional to 398,765.64, 598,208.31 and 128,803.62 is: 193,224.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,765.64 : 598,208.31 = 128,803.62 : x
  2. Step 2: Convert to fraction form
    398,765.64/598,208.31 = 128,803.62/x
  3. Step 3: Cross multiply
    398,765.64x = 598,208.31 × 128,803.62
  4. Step 4: Simplify right side
    398,765.64x = 77,051,395,842.08
  5. Step 5: Solve for x
    x = 77,051,395,842.08/398,765.64
  6. Step 6: Final answer
    x = 193,224.76

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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.