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Finding the Fourth Proportional to 145.67, 218.70 and 99.90

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Solution

The fourth proportional to 145.67, 218.70 and 99.90 is: 149.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.67 : 218.70 = 99.90 : x
  2. Step 2: Convert to fraction form
    145.67/218.70 = 99.90/x
  3. Step 3: Cross multiply
    145.67x = 218.70 × 99.90
  4. Step 4: Simplify right side
    145.67x = 21,848.13
  5. Step 5: Solve for x
    x = 21,848.13/145.67
  6. Step 6: Final answer
    x = 149.99

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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.