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Finding the Fourth Proportional to 398,807.01, 598,326.35 and 128,929.39

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Solution

The fourth proportional to 398,807.01, 598,326.35 and 128,929.39 is: 193,431.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,807.01 : 598,326.35 = 128,929.39 : x
  2. Step 2: Convert to fraction form
    398,807.01/598,326.35 = 128,929.39/x
  3. Step 3: Cross multiply
    398,807.01x = 598,326.35 × 128,929.39
  4. Step 4: Simplify right side
    398,807.01x = 77,141,849,185.96
  5. Step 5: Solve for x
    x = 77,141,849,185.96/398,807.01
  6. Step 6: Final answer
    x = 193,431.53

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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.