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Finding the Fourth Proportional to 214.99, 322.38 and 78.01

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Solution

The fourth proportional to 214.99, 322.38 and 78.01 is: 116.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.99 : 322.38 = 78.01 : x
  2. Step 2: Convert to fraction form
    214.99/322.38 = 78.01/x
  3. Step 3: Cross multiply
    214.99x = 322.38 × 78.01
  4. Step 4: Simplify right side
    214.99x = 25,148.86
  5. Step 5: Solve for x
    x = 25,148.86/214.99
  6. Step 6: Final answer
    x = 116.98

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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.