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Finding the Fourth Proportional to 145.34, 217.64 and 99.63

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Solution

The fourth proportional to 145.34, 217.64 and 99.63 is: 149.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.34 : 217.64 = 99.63 : x
  2. Step 2: Convert to fraction form
    145.34/217.64 = 99.63/x
  3. Step 3: Cross multiply
    145.34x = 217.64 × 99.63
  4. Step 4: Simplify right side
    145.34x = 21,683.16
  5. Step 5: Solve for x
    x = 21,683.16/145.34
  6. Step 6: Final answer
    x = 149.18

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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.