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Finding the Fourth Proportional to 400.90, 601.28 and 157.40

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Solution

The fourth proportional to 400.90, 601.28 and 157.40 is: 236.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.90 : 601.28 = 157.40 : x
  2. Step 2: Convert to fraction form
    400.90/601.28 = 157.40/x
  3. Step 3: Cross multiply
    400.90x = 601.28 × 157.40
  4. Step 4: Simplify right side
    400.90x = 94,640.69
  5. Step 5: Solve for x
    x = 94,640.69/400.90
  6. Step 6: Final answer
    x = 236.07

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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.