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Finding the Fourth Proportional to 398,908.80, 598,363.20 and 162,421.20

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Solution

The fourth proportional to 398,908.80, 598,363.20 and 162,421.20 is: 243,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,908.80 : 598,363.20 = 162,421.20 : x
  2. Step 2: Convert to fraction form
    398,908.80/598,363.20 = 162,421.20/x
  3. Step 3: Cross multiply
    398,908.80x = 598,363.20 × 162,421.20
  4. Step 4: Simplify right side
    398,908.80x = 97,186,868,979.84
  5. Step 5: Solve for x
    x = 97,186,868,979.84/398,908.80
  6. Step 6: Final answer
    x = 243,631.80

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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.