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Finding the Fourth Proportional to 398,818.64, 598,343.79 and 128,941.02

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Solution

The fourth proportional to 398,818.64, 598,343.79 and 128,941.02 is: 193,448.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,818.64 : 598,343.79 = 128,941.02 : x
  2. Step 2: Convert to fraction form
    398,818.64/598,343.79 = 128,941.02/x
  3. Step 3: Cross multiply
    398,818.64x = 598,343.79 × 128,941.02
  4. Step 4: Simplify right side
    398,818.64x = 77,151,058,593.27
  5. Step 5: Solve for x
    x = 77,151,058,593.27/398,818.64
  6. Step 6: Final answer
    x = 193,448.98

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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.