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Finding the Fourth Proportional to 288.99, 398.78 and 158.00

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Solution

The fourth proportional to 288.99, 398.78 and 158.00 is: 218.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.99 : 398.78 = 158.00 : x
  2. Step 2: Convert to fraction form
    288.99/398.78 = 158.00/x
  3. Step 3: Cross multiply
    288.99x = 398.78 × 158.00
  4. Step 4: Simplify right side
    288.99x = 63,005.25
  5. Step 5: Solve for x
    x = 63,005.25/288.99
  6. Step 6: Final answer
    x = 218.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.