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Finding the Fourth Proportional to 145.61, 218.15 and 102.21

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Solution

The fourth proportional to 145.61, 218.15 and 102.21 is: 153.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.61 : 218.15 = 102.21 : x
  2. Step 2: Convert to fraction form
    145.61/218.15 = 102.21/x
  3. Step 3: Cross multiply
    145.61x = 218.15 × 102.21
  4. Step 4: Simplify right side
    145.61x = 22,296.17
  5. Step 5: Solve for x
    x = 22,296.17/145.61
  6. Step 6: Final answer
    x = 153.12

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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.